#supermassiveblackholes — Public Fediverse posts

https://www.europesays.com/ie/735296/ NASA’s Chandra Breaks Down ‘Treble Clef’s’ Galaxy Cluster Collision #BlackHoles #ChandraXRayObservatory #Éire #IE #Ireland #MarshallAstrophysics #MarshallScienceResearch&Projects #MarshallSpaceFlightCenter #Science #Space #SupermassiveBlackHoles #TheUniverse

https://www.europesays.com/uk/1254115/ NASA’s Chandra Breaks Down ‘Treble Clef’s’ Galaxy Cluster Collision #BlackHoles #ChandraXRayObservatory #MarshallAstrophysics #MarshallScienceResearch&Projects #MarshallSpaceFlightCenter #Science #Space #SupermassiveBlackHoles #TheUniverse #UK #UnitedKingdom

Supercomputer simulations may finally explain Webb’s mysterious Little Red Dots

Simulations suggest ma…
#NewsBeep #News #Science #Astronomy #ATERUIIII #AU #Australia #blackholegrowth #blackholeseeds #cosmicdawn #cosmologicalsimulations #Cosmology #directcollapseblackholes #EarlyUniverse #far-ultravioletradiation #Jameswebbspacetelescope #JWST #littlereddots #nature #NewDiscoveries #Quasars #research #SpaceNews #super-Eddingtonaccretion #supermassiveblackholes
https://www.newsbeep.com/au/898024/

JWST finds mysterious red objects pairing up in the early universe

JWST images have revealed four candidate pairs of “little red dots,” comp…
#NewsBeep #News #Science #activegalacticnuclei #Astronomy #AU #Australia #blackholemergers #BlackHoles #Cosmology #cosmos-web #EarlyUniverse #GalaxyMergers #Gravitationalwaves #infraredastronomy #Jameswebbspacetelescope #JWST #KavliIPMU #lisa #littlereddots #research #SpaceNews #supermassiveblackholes #UniversityofTokyo
https://www.newsbeep.com/au/878688/

Astronomers hear a mysterious ‘hum’ across the universe; one explanation begins with strange dark stars 13 billion years ago

Astronomers may have found a new way to investigate one of the biggest mysteries in cosmic history: how…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Science #blackholeformation #cosmichistory #Darkmatter #DarkStars #earlyuniverse #gravitationalwaves #PulsarTimingArrays #supermassiveblackholes
https://www.newsbeep.com/us/831643/

A Star's Orbit Offers Clues About Black Hole Behavior

📰 Original title: The Galaxy’s Fastest Star Could Reveal the Secrets of a Supermassive Black Hole

🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️

View full AI summary https://en.killbait.com/a-star-s-orbit-offers-clues-about-black-hole-behavior.html?utm_source=mastodon_social&utm_medium=social&utm_campaign=killbait.mastodon_social

#astronomy #supermassiveblackholes #stellarmotion #astrophysics

https://www.europesays.com/ie/645020/ Rohan Naidu’s Journey From Engineering to Astronomer: Inside the Puzzling ‘Black Hole Star’ Discovery Reshaping Our View of the Early Universe #AstronomyCareer #BigBang #BlackHoleStar #EarlyUniverse #Éire #GalacticArchaeology #GLASSZ13 #HubbleFellow #HyderabadAstronomer #IE #Ireland #JamesWebb #LittleRedDots #MITAstrophysics #MoMBH1 #RohanNaidu #Science #Space #SupermassiveBlackholes #YaleNUS

https://www.europesays.com/ie/636308/ First known black hole star discovered by James Webb Space Telescope #Astronomy #AstronomyDiscoveries #astrophysics #BlackHoleFormation #BlackHoleStar #BlackHoles #CosmicDawn #CosmicEvolution #cosmology #EarlyUniverse #Éire #Galaxies #IE #Ireland #JamesWebbSpaceTelescope #jwst #LittleRedDots #MoMBH1 #nasa #nature #Science #Space #SpaceScience #SupermassiveBlackHoles

An all-sky map of half a million supermassive black holes

https://www.sdss.org/black-hole-mapper-release-20/

Comments: https://news.ycombinator.com/item?id=49211921

#HackerNews #supermassiveblackholes #astronomy #space #exploration #cosmicdiscovery #blackholemapper

How do supermassive black holes grow? AI finds 7 spacetime-warping ‘quasars’ that could help solve the mystery

When you buy through links on our articles, Future and its syndication partners may earn a commission. This…
#NewsBeep #News #Science #Artificialintelligence #AU #Australia #BlackHoles #DarkEnergySpectroscopicInstrument #desi #gravitationallenses #magnifyingglasses #OhioStateUniversity #promisingcandidates #Quasars #STScI #supermassiveblackholes
https://www.newsbeep.com/au/837435/

https://www.europesays.com/ie/607633/ NASA’s Swift Sees ‘Wandering’ Mega Black Hole Shredding Star #&BlackHolesResearch #astrophysics #BlackHoles #Éire #Galaxies #GoddardSpaceFlightCenter #IE #Ireland #NeilGehrelsSwiftObservatory #Science #Science&Research #Space #stars #SupermassiveBlackHoles #TheUniverse

https://www.europesays.com/uk/1112991/ New study challenges existing knowledge for why galaxies stop forming stars #ActiveGalacticNuclei #Astronomy #BlackHoleFeedback #CentralGalaxies #CosmicEvolution #CosmologicalSimulations #Cosmology #DarkMatterHalos #FloridaInternationalUniversity #GalaxyEvolution #GalaxyMergers #GalaxyQuenching #IllustrisTNG #MachineLearning #Physics #QuiescentGalaxies #Research #Science #SpaceNews #StarFormation #SupermassiveBlackHoles #UK #UnitedKingdom

New study challenges existing knowledge for why galaxies stop forming stars

Most gala…
#NewsBeep #News #Space #activegalacticnuclei #Astronomy #AU #Australia #blackholefeedback #centralgalaxies #cosmicevolution #cosmologicalsimulations #Cosmology #darkmatterhalos #FloridaInternationalUniversity #GalaxyEvolution #GalaxyMergers #galaxyquenching #IllustrisTNG #machinelearning #quiescentgalaxies #research #Science #SpaceNews #Starformation #supermassiveblackholes
https://www.newsbeep.com/au/825382/

New study challenges existing knowledge for why galaxies stop forming stars

Mos…
#NewsBeep #News #Physics #activegalacticnuclei #astronomy #blackholefeedback #centralgalaxies #cosmicevolution #cosmologicalsimulations #Cosmology #darkmatterhalos #FloridaInternationalUniversity #GalaxyEvolution #galaxymergers #galaxyquenching #IllustrisTNG #Machinelearning #quiescentgalaxies #research #Science #SpaceNews #Starformation #supermassiveblackholes #UK #UnitedKingdom
https://www.newsbeep.com/uk/712443/

https://www.europesays.com/ie/605327/ New study challenges existing knowledge for why galaxies stop forming stars #ActiveGalacticNuclei #Astronomy #BlackHoleFeedback #CentralGalaxies #CosmicEvolution #CosmologicalSimulations #cosmology #DarkMatterHalos #Éire #FloridaInternationalUniversity #GalaxyEvolution #GalaxyMergers #GalaxyQuenching #IE #IllustrisTNG #Ireland #MachineLearning #QuiescentGalaxies #Research #Science #Space #SpaceNews #StarFormation #SupermassiveBlackHoles

New study challenges existing knowledge for why galaxies stop forming stars

Most galaxy collisi…
#NewsBeep #News #Science #activegalacticnuclei #Astronomy #blackholefeedback #CA #Canada #centralgalaxies #cosmicevolution #cosmologicalsimulations #Cosmology #darkmatterhalos #FloridaInternationalUniversity #GalaxyEvolution #galaxymergers #galaxyquenching #IllustrisTNG #machinelearning #quiescentgalaxies #research #SpaceNews #starformation #supermassiveblackholes
https://www.newsbeep.com/ca/827510/

https://www.europesays.com/ie/580260/ Euclid finds 31 ancient quasars, including 2 that set a record for earliest ever seen #BlackHoles #Éire #Euclid #IE #Ireland #Quasars #Science #SupermassiveBlackHoles

‘What we found was striking’: Physicists detect new kind of signal from a black hole’s ‘point of no return’

When you buy through links on our articles, Future and its syndication partners may earn a commission. An…
#NewsBeep #News #Physics #AU #Australia #Blackhole #eventhorizon #Gravitationalwaves #Science #signal #supermassiveblackholes
https://www.newsbeep.com/au/790836/

‘What we found was striking’: Physicists detect new kind of signal from a black hole’s ‘point of no return’

When you buy through links on our articles, Future and its syndication partners may earn a commission. An…
#NewsBeep #News #Physics #BlackHole #eventhorizon #gravitationalwaves #Science #signal #supermassiveblackholes #UK #UnitedKingdom
https://www.newsbeep.com/uk/683699/

Supermassive black holes may be surrounded by dark matter clusters, new ‘echo map’ technique suggests

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit:…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Physics #accretiondisk #Blackholes #Darkmatter #gravitationalinfluence #MayankSharma #mysterioussubstance #ordinarymatter #Science #supermassiveblackholes #visiblematter
https://www.newsbeep.com/us/717471/

Supermassive black holes may be surrounded by dark matter clusters, new ‘echo map’ technique suggests

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit:…
#NewsBeep #News #Physics #accretiondisk #AU #Australia #BlackHoles #darkmatter #gravitationalinfluence #MayankSharma #mysterioussubstance #ordinarymatter #Science #supermassiveblackholes #visiblematter
https://www.newsbeep.com/au/750966/

Supermassive black holes may be surrounded by dark matter clusters, new ‘echo map’ technique suggests

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit:…
#NewsBeep #News #Physics #accretiondisk #Blackholes #darkmatter #gravitationalinfluence #MayankSharma #mysterioussubstance #ordinarymatter #Science #supermassiveblackholes #UK #UnitedKingdom #visiblematter
https://www.newsbeep.com/uk/650627/

https://www.europesays.com/uk/1040773/ Supermassive black holes may be surrounded by dark matter clusters, new ‘echo map’ technique suggests #AccretionDisk #BlackHoles #DarkMatter #GravitationalInfluence #MayankSharma #MysteriousSubstance #OrdinaryMatter #Physics #Science #SupermassiveBlackHoles #UK #UnitedKingdom #VisibleMatter

https://www.europesays.com/ie/546097/ Supermassive black holes may be surrounded by dark matter clusters, new ‘echo map’ technique suggests #AccretionDisk #BlackHoles #DarkMatter #Éire #GravitationalInfluence #IE #Ireland #MayankSharma #MysteriousSubstance #OrdinaryMatter #Science #SupermassiveBlackHoles #VisibleMatter

How did the first #SupermassiveBlackHoles form? #DoctoralCandidate Sarah Pappert researches this question using instrumentation for the Extremely Large Telescope. She has now received the Zonta #WomenInSTEM Award! http://go.tum.de/396363👏

#Astrophysics

📷 MPE

Yeeting humans out of Earth like pinball.

In terms of its speed, this quasar's wind could be called a category 79 hurricane. Every category of hurricane is about 20% faster than the category below it. Calling it category 79 gives an idea of just how fast it is, but of course this wind is unlike anything on Earth.

https://www.space.com/astronomy/black-holes/these-record-breaking-black-hole-winds-could-create-a-category-79-hurricane-on-earth

#Wind #BlackHole #SupermassiveBlackHoles #Hurricane #Speed #Space #Science #Quasar #J2318 #GravitationalForces #Energy

https://www.europesays.com/ie/522954/ Milky Way’s giant black hole blows surprisingly gentle breeze #Éire #IE #Ireland #MilkyWay #Science #SupermassiveBlackHoles

https://www.europesays.com/uk/1009644/ Astronomers Discover Two Monster Black Holes Creating a Cosmic Void as They Merge #ActiveGalacticNuclei #Astrophysics #BlackHoles #CosmicVoids #GalaxyCores #HubbleSpaceTelescope #JamesWebbSpaceTelescope #jwst #Physics #Science #SpaceExploration #StellarDynamics #SupermassiveBlackHoles #UK #UnitedKingdom

Astronomers Discover Two Monster Black Holes Creating a Cosmic Void as They Merge

Artistic depiction, for illustrative purposes online. Space is usually crowded at the center of a giant galaxy. Stars…
#NewsBeep #News #Physics #activegalacticnuclei #Astrophysics #Blackholes #cosmicvoids #galaxycores #HubbleSpaceTelescope #jameswebbspacetelescope #jwst #Science #SpaceExploration #stellardynamics #supermassiveblackholes #UK #UnitedKingdom
https://www.newsbeep.com/uk/624689/

Weekly Update from the Open Journal of Astrophysics – 06/06/2026

Another Saturday, another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further five papers, bringing the number in Volume 9 (2026) to 119 and the total so far published by OJAp up to 567.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week, published on Tuesday 2nd June, is “The impact of the formation channel on gravitational-wave-galaxy cross-correlations” by Kabir Chakravarti (Chennai Mathematical Institute, India) and Federico R Urban (CEICO-FZU, Czech Republic). This article, published in the folder Cosmology and Nongalactic Astrophysics, explores how uncertainties in binary formation affect the cross-correlation signal between gravitational wave events and galaxy catalogues, finding that time-delay distribution significantly impacts the signal.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116679308847047911

The second paper for this week, also published on Tuesday 2nd June but in the folder High-Energy Astrophysical Phenomena, is “Transient X-ray Sources as Extremely Eccentric Mass-Transfer Binaries with Compact Companions” by Jonathan I Katz and Michael A Nowak (Washington University, St Louis, USA). This article suggests that X-ray transients, similar to tidal disruption events, are produced in eccentric stellar-compact object binaries, with their frequency gradually increasing over time.

The overlay for this one looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116679395198117735

Next one up, the third paper of the week, also published on Tuesday 2nd June in the folder High-Energy Astrophysical Phenomena is “Resolving the (Debate About) Nozzle Shocks in Tidal Disruption Events” by Zachary L. Andalman & Eliot Quataert (Princeton U., USA), Eric R. Coughlin (Syracuse U. USA) and C. J. Nixon (U. Leeds, UK). This paper presents a model to understand the role of nozzle shocks in the circularization of stellar debris during a tidal disruption event when a star approaches a supermassive black hole (SMBH)

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116679426224933831

The fourth paper this week, published on Wednesday 3rd June in the folder Cosmology and Nongalactic Astrophysics, is “Validating Digital Twins of the Local Universe with the Thermal Sunyaev-Zel’dovich Signal” by Richard Stiskalek (University of Oxford, UK) and Harry Desmond (University of Portsmouth, UK). The thermal Sunyaev-Zel’dovich effect and constrained simulations are used to analyze the thermal pressure of ionized gas in galaxy clusters and produce a set of digital twins for cosmological study.

The overlay is here:

The officially accepted version can be found on arXiv here and here is the Mastodon announcement:

https://fediscience.org/@OJ_Astro/116684470440285496

The fifth and final paper this week, published on Thursday 4th June in the folder Cosmology and Nongalactic Astrophysics is “Photon (Non)Conservation in the Reduced Speed of Light Approximation and How to (Almost) Fix It” by Nickolay Y. Gnedin (University of Chicago, USA). The “Reduced Speed of Light” approximation in cosmological simulations can lead to photon non-conservation, and while some missing photons can be counted, adding them back is challenging.

The overlay for this one is here:

The officially accepted version of this paper can be found on arXiv here and Mastodon announcement here

https://fediscience.org/@OJ_Astro/116691566968428861

And that concludes this week’s update. I’ll do another one next Saturday.

https://www.europesays.com/ie/521295/ Astronomers Discover Two Monster Black Holes Creating a Cosmic Void as They Merge #ActiveGalacticNuclei #astrophysics #BlackHoles #CosmicVoids #Éire #GalaxyCores #HubbleSpaceTelescope #IE #Ireland #JamesWebbSpaceTelescope #jwst #Science #Space #SpaceExploration #StellarDynamics #SupermassiveBlackHoles

Massive black hole from the early universe has astronomers looking back to the Big Bang

Far back in cosmic time, one small red object is refusing to behave. Abell 2744–QSO1 app…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Space #Abell2744-QSO1 #Astronomy #BoyuanLiu #Cosmology #earlyuniverse #GalaxyFormation #JamesWebbSpaceTelescope #LittleRedDots #metal-poorgalaxies #primordialblackholes #Research #Science #SpaceNews #supermassiveblackholes
https://www.newsbeep.com/us/635713/

Weekly Update from the Open Journal of Astrophysics – 02/05/2026

Here we are, on schedule, with another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further seven papers, bringing the number in Volume 9 (2026) to 94 and the total so far published by OJAp up to 542. I checked the corresponding update for last year (on 3rd May 2025), and we’ve had an increase from 54 to 94 in papers published (about 74%) between the first four months of 2025 and the first four months of 2026.

I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter (which nobody should be using); these announcements also show the DOI for each paper.

The first paper to report this week is “DESI-DR1 3 × 2-pt analysis: consistent cosmology across weak lensing surveys” by Anna Porredon (CIEMAT, Madrid, Spain) and 72 others (DESI Colllaboration). This paper was published on Tuesday 28th April in the folder Cosmology and Nongalactic Astrophysics. This paper presents a joint cosmological analysis of galaxy clustering and gravitational lensing observations, providing consistent constraints on cosmological parameters. The analysis also introduces a new blinding procedure to prevent confirmation bias. See this post for news of an important DESI milestone.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116480407578621011

The second paper for this week, also published on Tuesday 28th April but in the folder High-Energy Astrophysical Phenomena is “Masers and Broad-Line Mapping Favor Magnetically-Dominated AGN Accretion Disks” by Philip F. Hopkins (Caltech, USA), Dalya Baron (Stanford U., USA) and Joanna M. Piotrowska (Caltech). This one presents a new constraint on supermassive black hole accretion disks physics, suggesting that outer regions are likely in a ‘hyper-magnetized’ state, as thermal or radiation pressure models appear inconsistent.

The overlay for this one is here:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116480505354195181

Next one up, the third paper of the week, is “Galaxy mergers and disk angular momentum evolution: stellar halos as a critical test” by Eric F. Bell (U. Michigan, Ann Arbor, USA), Richard D’Souza (Vatican Observatory), Monica Valluri & Katya Gozman (U. Michigan). This was published on Wednesday 29th April in the folder Astrophysics of Galaxies. The paper argues that satellite accretion impacts the angular momentum evolution of galaxies, often causing significant reorientation. This process is detectable in Milky Way-mass galaxies so the idea is testable observationally.

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116486649450860283

The fourth paper this week, published on Thursday April 30th, is “Time-Dilation Methods for Extreme Multiscale Timestepping Problems” by Philip F. Hopkins and Elias R. Most (Caltech, USA). This paper is in the folder Instrumentation and Methods for Astrophysics: it presents a new method for astrophysical simulations that modulates time evolution with a variable dilation/stretch factor, improving efficiency and accuracy in modeling processes across different scales.

The overlay is here:

The finally accepted version of this paper can be found here and the Mastodon announcement follows:

https://fediscience.org/@OJ_Astro/116492226856595031

The fifth article of this week was also published on Thursday 30th April, but in the folder Astrophysics of Galaxies. The title is “Cosmic Rays on Galaxy Scales: Progress and Pitfalls for CR-MHD Dynamical Models” and the author is Philip F. Hopkins (Caltech, USA) who has three papers featured this week. The paper presents an overview of cosmic ray (CR) modeling, highlighting its influence on galactic physics and star formation. It addresses previous modeling errors and presents new methods for full-spectrum dynamics.

The overlay is here:

You can find the authorized version of this paper on arXiv here and the Fediverse announcement is here:

https://fediscience.org/@OJ_Astro/116492282488422075

The sixth paper of the week is “Baryonification III: An accurate analytical model for the dispersion measure probability density function of fast radio bursts” by MohammadReza Torkamani (Universität Bonn, Germany) and 8 others based in Germany, Switzerland, UK and Sweden. This article was also published on Thursday April 30th in the folder Cosmology and Nongalactic Astrophysics. It presents a framework for predicting dispersion measures of fast radio bursts using the baryonification model, providing a cost-effective alternative to hydrodynamical simulations. The model’s accuracy is validated through full numerical simulations. The overlay is here:

You can find the officially-accepted version on arXiv here and the Mastodon announcement here:

https://fediscience.org/@OJ_Astro/116492403170125062

Seventh and finally for this week we have “The stellar and dark matter distributions in early-type galaxies measured by stacked weak gravitational lensing” by Momoka Fujikawa and Masamune Oguri (Chiba University, Japan). This study uses weak gravitational lensing to investigate stellar mass and dark matter density in red galaxies, suggesting a stronger feedback effect than current simulations predict. This was published on Friday 1st May 2026 in the folder Astrophysics of Galaxies. The overlay is here:

You can find the officially-accepted version on arXiv here and the Fediverse announcement is here:

https://fediscience.org/@OJ_Astro/116497987401632687

And that concludes this week’s update. I’ll do another one at the end of next week. Will Vol. 9 have reached a hundred by then?

P.S. Just a reminder that, thanks to the efforts of a member of our Editorial Board, the Open Journal of Astrophysics now has a Wikipedia page.

Direct collapse black hole candidates from decaying dark matter: https://iopscience.iop.org/article/10.1088/1475-7516/2026/04/034 -> Dark matter could explain earliest #SupermassiveBlackHoles: https://news.ucr.edu/articles/2026/04/15/dark-matter-could-explain-earliest-supermassive-black-holes - dark matter decays could be the missing ingredient explaining how giant black holes formed before the first stars.

This evening I learned the following bizarre things:
0/ Colliding massive objects create gravity waves (this I already knew).
1/ When spinning black holes collide, they experience an acceleration at right angles to the sum of the spins.
2/ The bigger the black holes, the greater the acceleration and resulting speed.
3/ When this happens with galactic core supermassive black holes, this can exceed the escape velocity of the galaxies.
4/ When one of these high-speed supermassive black holes encounters a dust or gas cloud, it creates a contrail of stars! And we can see these star-contrails - straight lines of stars, scattered across the cosmos!

Thank-you Professor David Blair!

https://science.nasa.gov/missions/hubble/hubble-sees-possible-runaway-black-hole-creating-a-trail-of-stars/

#Astronomy #Astrophysics #Astrodon #BlackHoles #GravityWaves #SuperMassiveBlackHoles

NASA, Partners Advance LISA Prototype Hardware https://science.nasa.gov/missions/lisa/nasa-partners-advance-lisa-prototype-hardware/ #NASA #Astrophysics #BlackHoles #Galaxies #GalaxyMergers #GoddardSpaceFlightCenter #GravitationalWaves #LISALaserInterferometerSpaceAntenna #SupermassiveBlackHoles #TheUniverse

NASA, Partners Advance LISA Prototype Hardware

https://web.brid.gy/r/https://science.nasa.gov/missions/lisa/nasa-partners-advance-lisa-prototype-hardware/

It looks like the end of a mosquito's proboscis has run amok.

https://www.space.com/astronomy/black-holes/james-webb-space-telescope-confirms-1st-runaway-supermassive-black-hole-rocketing-through-cosmic-owl-galaxies-at-2-2-million-mph-it-boggles-the-mind

#Mosquitos #Space #OuterSpace #BlackHoles #SupermassiveBlackHoles #Astronomy

Black Holes, Hawking Radiation (and AI…)

It seems to be a common misapprehension that the energy released by the supermassive black holes in, for example, active galactic nuclei is in the form of Hawking radiation. It isn’t. Hawking radiation is only significant for black holes of very low mass. The radiation produced around supermassive black holes is due to the extremely high density and temperate of matter falling into the black hole through an accretion disk not due to the evaporation of the black hole itself. Hawking radiation has never been experimentally detected.

Hawking showed that the a black hole will produce black-body radiation with a temperature, the Hawking Temperature, given by TH in a beautiful formula below that brings together constants relating to gravity, statistical mechanics, quantum theory and relativity:

You can see that the Hawking Temperature is inversely proportional to the mass of the black hole M so is largest for very small black holes. In fact for a black hole with mass of order that of the Moon, the Hawking Temperature is just 3 Kelvin. Since the Universe is bathed in cosmic radiation with this temperature, such a black hole would not evaporate at all because it would absorb as much radiation as it emits by the Hawking mechanism as would any black hole of mass greater than this. The Hawking temperature for a supermassive black hole is many orders of magnitude lower than this, so Hawking radiation is completely irrelevant.

Notice that if a black hole does start to evaporate then its mass begins to decrease. Its Hawking temperature therefore increases so its mass decreases even more quickly. In the end the mass gets so low and the temperature so high that the black hole effectively explodes. Nobody really knows how to describe the final stage as it relies on physics we don’t understand.

Anyway, this all reminds that years ago I set an examination question that involved applying the Hawking formula above to calculate the lifetime of a black hole of mass M. It’s not too hard to show that it scales as M-3. Another part of the question asked: what is the mass of a black hole whose Hawking Temperature is room temperature (say 300 K), what would be the Schwarzschild radius of such a black hole, and what would be its lifetime?

I’ll leave it to my readers to plug the numbers into the Hawking formula above to derive the mass, etc. Please submit your answers through the comments box below. The first correct entry does not win a prize, not even a joke Peace Prize.

For a laugh I asked Google for the answer. Here is the AI summary:

Bonus marks for pointing out everything that’s wrong in this summary.

#blackHoles #genai #google #hawkingRadiation #hawkingTemperature #supermassiveBlackHoles

While we're on the subject of the horrifying scale of the Universe, I cannot get over what big fat bastard the SMBH at the centre of M87 is when compared to ours!

#Astrodon #SuperMassiveBlackHoles #M87 #MilkyWayGalaxy #Space

I'm watching Black Hole Apocalypse: What's Inside a Black Hole? and the #scientists and presenters are quite puzzled at how the early Universe's #SuperMassiveBlackHoles could grow so large in such a (relatively) short period of time, basically saying 500 million years wasn't anywhere near enough time for them to grow.

And I'm sitting here wondering where the confusion is (with regards to the early super-massive black holes) because wasn't it #Einstein himself that showed us that #gravity slows down #time? And wasn't it #Newton who showed us that gravity's effects are proportionate to an object's density? Basically the more dense something is the greater the effect the object's gravity will exert.

Anyhow, my point is time probably behaved differently back then than it does today, and therefore 500 million years by todays' reality may as well have been 500 billion years objects back then experienced "time" as.

NASA’s Chandra Finds Black Hole With Tremendous Growth https://www.nasa.gov/missions/chandra/nasas-chandra-finds-black-hole-with-tremendous-growth/ #NASA #ChandraXRayObservatory #Astrophysics #BlackHoles #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #MarshallAstrophysics #MarshallSpaceFlightCenter #Quasars #ScienceResearch #SupermassiveBlackHoles #TheUniverse

NASA’s Chandra Sees Surprisingly Strong Black Hole Jet at Cosmic “Noon” https://www.nasa.gov/image-article/nasas-chandra-sees-surprisingly-strong-black-hole-jet-at-cosmic-noon/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #GalaxiesStarsBlackHoles #MarshallAstrophysics #MarshallSpaceFlightCenter #Quasars #SupermassiveBlackHoles #TheUniverse

NASA’s IXPE Reveals X-ray-Generating Particles in Black Hole Jets https://www.nasa.gov/missions/ixpe/nasas-ixpe-reveals-x-ray-generating-particles-in-black-hole-jets/ #NASA #IXPEImagingXRayPolarimetryExplorer #Astrophysics #BlackHoles #MarshallAstrophysics #MarshallScienceResearchProjects #MarshallSpaceFlightCenter #SupermassiveBlackHoles #TheUniverse

NASA’s NICER Maps Debris From Recurring Cosmic Crashes https://science.nasa.gov/universe/nasas-nicer-maps-debris-from-recurring-cosmic-crashes/ #NASA #Astrophysics #BlackHoles #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #InternationalSpaceStationISS #ISSResearch #NICERNeutronStarInteriorCompositionExplorer #ScienceResearch #SupermassiveBlackHoles #TheUniverse #XRayAstronomy

Weekly Update at the Open Journal of Astrophysics – 22/03/2025

It’s Satuday morning once again, and time for another update of papers published at the Open Journal of Astrophysics. Since the last update we have published two papers, which brings the number in Volume 8 (2025) up to 29 and the total so far published by OJAp up to 264.

The papers we have published this week are connected by the theme of black holes and their role in galaxy formation, which is a very hot topic nowadays!

The first paper to report is “Hawking Radiation from non-evaporating primordial black holes cannot enable the formation of direct collapse black holes” by Jonathan Regan, Marios Kalomenopoulos and Kelly Kosmo O’Neil of the University of Nevada, USA. This paper, which is based on an undergraduate thesis, is a study of the irradiating effects of primordial black holes and a discussion of whether these might influence the subsequent formation of supermassive black holes. It is in the section marked Astrophysics of Galaxies, and was published on Tuesday  18th March.

The overlay is here:

and you can find the final accepted version on arXiv here.

The second paper, which was published on Wednesday 19th March and is also in the folder Astrophysics of Galaxies, is “First Light and Reionization Epoch Simulations (FLARES) – XV: The physical properties of super-massive black holes and their impact on galaxies in the early universe” by Stephen Wilkins & Jussi K. Kuusisto (U. Sussex, UK), Dimitrios Irodotou (Institute of Cancer Research, UK), Shihong Liao (Beijing, China) Christopher C. Lovell (Portsmouth, UK), Sonja Soininen (Insitute of Cancer Research), Sabrina C. Berger (Melbourne, Australia), Sophie L. Newman (Portsmouth, UK), William J. Roper (Sussex), Louise T. C. Seeyave (Sussex), Peter A. Thomas (Sussex) and Aswin P. Vijayan Sussex). This paper uses cosmological hydrodynamical zoom simulations to study the formation of supermassive black holes and their impact on star formation in the early Universe.

Here is the overlay, which you can click on to make larger if you wish:

You can read the officially accepted version of this paper on arXiv here.

That’s all for this week. It’s been a bit frustrating for me as Managing Ediutor, because we have built up a backlog of several papers that were accepted for publication some time ago, but are still waiting for the authors to place the final version on arXiv. I hope these won’t take too long to appear, not least because I would like to clear my workflow on the Scholastica platform!

#arXiv240402815v3 #arXiv241109081v2 #AstrophysicsOfGalaxies #DiamondOpenAccess #FirstLight #FLARES #galaxyFormation #HawkingRadiation #OpenAccessPublishing #OpenJournalOfAstrophysics #primordialBlackHoles #reionization #supermassiveBlackHoles

https://www.space.com/the-universe/black-holes/a-monster-black-hole-may-be-hiding-in-the-galaxy-next-door-it-is-astounding

#science #astronomy #astrophysics #LargeMagellanicCloud #supermassiveblackholes

Was reading some online slides and came across this excellent #RadioAstronomy image from the NRAO/AUI/NSF.

The terrestrial portion is optical wavelengths. Above this is radio wavelengths.

Those are not stars. They are radio sources.

They're supermassive black holes in the centres of galaxies.

The sky portion of this image was taken by the now fallen 300-ft radio telescope, pictured here as the largest dish between the smaller dishes.

If you had a radio wavelength-detecting eye that was 300 feet in diameter, this is how the sky would look to you.

A sea sprinkled with ancient light.

You can download this image, and use it from this link from the NRAO site here: https://www.nrao.edu/archives/items/show/33605

Be sure to attribute properly and just copy my alt-text.

You can also read the paper here: https://articles.adsabs.harvard.edu/pdf/1994AJ....107.1829C

#RadioAstronomy #SupermassiveBlackHoles #Astrodon

Black Holes Can Cook for Themselves, Chandra Study Shows https://www.nasa.gov/image-article/black-holes-can-cook-for-themselves-chandra-study-shows/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #Galaxies #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #MarshallAstrophysics #MarshallScienceResearchProjects #MarshallSpaceFlightCenter #SupermassiveBlackHoles

Black Holes Can Cook for Themselves, Chandra Study Shows https://www.nasa.gov/image-article/black-holes-can-cook-for-themselves-chandra-study-shows/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #Galaxies #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #MarshallSpaceFlightCenter #SupermassiveBlackHoles

Newfound Galaxy Class May Indicate Early Black Hole Growth, Webb Finds https://science.nasa.gov/missions/webb/newfound-galaxy-class-may-indicate-early-black-hole-growth-webb-finds/ #NASA #Astrophysics #BlackHoles #Galaxies #GalaxiesStarsBlackHoles #GoddardSpaceFlightCenter #JamesWebbSpaceTelescopeJWST #ScienceResearch #SupermassiveBlackHoles #TheUniverse

Astronomers Catch Unprecedented Features at Brink of Active Black Hole https://science.nasa.gov/universe/black-holes/supermassive-black-holes/astronomers-catch-unprecedented-features-at-brink-of-active-black-hole/ #NASA #ActiveGalaxies #Astrophysics #BlackHoles #GalaxiesStarsBlackHoles #GoddardSpaceFlightCenter #JetPropulsionLaboratory #NeilGehrelsSwiftObservatory #NICERNeutronStarInteriorCompositionExplorer #NuSTARNuclearSpectroscopicTelescopeArray #SupermassiveBlackHoles #TheUniverse

NASA’s Swift Studies Gas-Churning Monster Black Holes https://science.nasa.gov/missions/swift/nasas-swift-studies-gas-churning-monster-black-holes/ #NASA #Astrophysics #BlackHoles #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #GoddardSpaceFlightCenter #NeilGehrelsSwiftObservatory #ScienceResearch #SupermassiveBlackHoles #TheUniverse

Black Hole Destroys Star, Goes After Another, NASA Missions Find https://www.nasa.gov/image-article/black-hole-destroys-star-goes-after-another-nasa-missions-find/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #MarshallSpaceFlightCenter #ScienceResearch #SupermassiveBlackHoles #TheUniverse

NASA Telescopes Work Out Black Hole’s Snack Schedule https://www.nasa.gov/image-article/nasa-telescopes-work-out-black-holes-snack-schedule/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #GalaxiesStarsBlackHolesResearch #MarshallSpaceFlightCenter #ScienceResearch #SupermassiveBlackHoles

Spitzer gives scientists insights into black hole eating habits https://www.nasaspaceflight.com/2024/05/black-hole-eating-habits/ #supermassiveblackholes #astrophysics #blackholes #andromeda #galaxies #milkyway #spitzer #other #nasa

Figuring out how fast supermassive black holes spin
https://www.space.com/black-holes-lense-thirring-effect-frame-dragging-spacetime

#space #science #BlackHoles #SupermassiveBlackHoles #spacetime

Spotted: ‘Death Star’ Black Holes in Action https://www.nasa.gov/image-article/spotted-death-star-black-holes-in-action/ #NASA #Astrophysics #BlackHoles #ChandraXRayObservatory #Galaxies #GalaxiesStarsBlackHoles #GalaxiesStarsBlackHolesResearch #GalaxyClusters #MarshallSpaceFlightCenter #ScienceResearch #SupermassiveBlackHoles #TheUniverse