#galaxy-cluster — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #galaxy-cluster, aggregated by home.social.
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Astronomers spot 2 ‘time-warped’ supernovas whose light both has and hasn’t reached Earth
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#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Space #ConorLarison #galaxycluster #ghostlyimages #gravitationallensing #HubbleSpaceTelescope #JamesWebbSpaceTelescope #multipleimages #Science #supernovas
https://www.newsbeep.com/us/442907/ -
An X-ray-Emitting Proto-Cluster at z ≈ 5.7 Reveals Rapid Structure Growth: https://chandra.si.edu/photo/2026/protoc/paper_high_z_cluster_bogdan.pdf -> NASA Telescopes Spot Surprisingly Mature #GalaxyCluster in Early Universe: https://chandra.si.edu/press/26_releases/press_012826.html
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CANUCS/Technicolor Data Release - Imaging, Photometry, Slit Spectroscopy, and Stellar Population Parameters: https://iopscience.iop.org/article/10.3847/1538-4365/ae1611 -> #GalaxyCluster in Technicolor: https://aasnova.org/2026/01/12/featured-image-galaxy-cluster-in-technicolor/
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Sunyaev–Zeldovich detection of hot intracluster gas at redshift 4.3: https://www.nature.com/articles/s41586-025-09901-3.epdf?sharing_token=NfWs_ojF_1OmLJTaiZ6CTNRgN0jAjWel9jnR3ZoTv0OMMxRMBI4MV6qYsuTyKatnPL939KgCe2QhxaUV94eHfgY4r7HMEe89QKD_HfVAh5P-YyrpVQ-BgGUS-HjTSTYrBdyY833CkrYg_EEdZD-l-bREZbiASmBa1DenABD0eK0%3D -> Weird clump in the early universe is piping hot and we don’t know why: https://www.newscientist.com/article/2509976-weird-clump-in-the-early-universe-is-piping-hot-and-we-dont-know-why/ - a #GalaxyCluster in the early universe is 10 times hotter than it ought to be, which may reshape how we think these enormous structures formed.
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Discovery and Multiwavelength Analysis of a New Dissociative #GalaxyCluster Merger - The Champagne Cluster: https://iopscience.iop.org/article/10.3847/1538-4357/ade67c -> NASA's Chandra Rings in New Year With Champagne Cluster: https://chandra.harvard.edu/photo/2025/champagne/
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Weekly Update from the Open Journal of Astrophysics – 04/10/2025
It’s Saturday again, so it’s time for a summary of the week’s new papers at the Open Journal of Astrophysics. Since the last update we have published five more papers, which brings the number in Volume 8 (2025) up to 146, and the total so far published by OJAp up to 381. At this rate Volume 8 will contain around 190 by the end of 2025.
Anyway, here are this week’s papers, starting with three published on Monday 29th September 2025.
The first paper is “Cosmic Multipoles in Galaxy Surveys II: Comparing Different Methods in Assessing the Cosmic Dipole” by Vasudev Mittal, Oliver T. Oayda and Geraint F. Lewis (U. Sydney, Australia). This is in the folder Cosmology and Nongalactic Astrophysics. It presents a comparison of methods for determining the number count dipole from cosmological surveys with a discussion of the implications for the known discordance with the CMB diple.
The overlay is here:
You can make this larger by clicking on it. The officially accepted version of this paper can be found on the arXiv here.
The second paper this week, also published on Monday 29th September, is “SDSS-C4 3028: the Nearest Blue Galaxy Cluster Devoid of an Intracluster Medium” by Shweta Jain (University of Kentucky, USA) and 11 others based in the USA, Australia and Korea. This describes a galaxy cluster with an unusually high fraction (about 63%) of star-forming galaxies which may be a result of ram pressure stripping; the article is in the folder Astrophysics of Galaxies.
The corresponding overlay is here:
You can find the officially accepted version on arXiv here.
The third one this week, published on also published on Monday 29th September but in the folder Earth and Planetary Astrophysics, is “Comparing the Architectures of Multiplanet Systems from Kepler, K2, and TESS Data” by Robert L Royer and Jason H. Steffen (University of Nevada, USA). This paper explores the trends seen in exoplanet survey data, including Kepler, TESS, and K2 including many planetary systems with multiple planets.
The overlay is here:
You can find the officially-accepted version on arXiv here.
The next one up is “Seeding Cores: A Pathway for Nuclear Star Clusters from Bound Star Clusters in the First Billion Years” by Fred Angelo Batan Garcia (Columbia University, USA), Massimo Ricotti (University of Maryland, USA) and Kazuyuki Sugimura (Hokkaido University, Japan). This paper was published on Thursday 2nd October in the folder Astrophysics of Galaxies. This is about modelling the formation of Nuclear Star Clusters using cosmological radiation-hydrodynamic simulations, with discussion of the implications for seeding supermassive black holes and the little red dots seen by JWST.
The corresponding overlay is here:
You can find the officially accepted version of this one on arXiv here.
The fifth and last one for this week, published on Friday 3rd October 2025, is “Efficient semi-analytic modelling of Pop III star formation from Cosmic Dawn to Reionization” by Sahil Hegde and Steven R. Furlanetto (University of Californi Los Angeles, USA). This is also in the folder marked Astrophysics of Galaxies. It uses a self-consistent analytic model to trace the formation of the first stars from their birth through the first billion years of the universe’s history. complementing semi-analytic and computational methods.
You can find the officially-accepted version of this paper on arxiv here.
That concludes the report for this week. I’ll post another update next Saturday.
#arXiv250308779v2 #arXiv250620654v3 #arXiv250719581v2 #arXiv250920651v1 #arXiv250922523v1 #AstrophysicsOfGalaxies #cosmicDipoles #CosmologyAndNonGalacticAstrophysics #DiamondOpenAccess #EarthAndPlanetaryAstrophysics #GalaxyCluster #galaxyFormation #galaxySurveys #JWST #Kepler #LittleRedDots #MultiplanetSystems #nuclearStarClusters #OpenAccessPublishing #OpenJournalOfAstrophysics #PopulationIIIStars #ramPressureStripping #SDSSC42028 #semiAnalyticGalaxyFormation #TheOpenJournalOfAstrophysics
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Portrait of a galaxy cluster
A massive, spacetime-warping cluster of galaxies, Abell 209, is the setting of today’s NASA/ESA Hubble Space Telescope Picture of the Week.
Credit: ESA/Hubble & NASA, M. Postman, P. Kelly
https://esahubble.org/images/potw2527a/#Cosmology #Astronomy #Astrophysics #Astrodon #science #galaxies #galaxycluster #Hubble #HST #Abell209 #astrophotography
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Webb and Chandra Image of Bullet Cluster Maps Invisible Dark Matter https://petapixel.com/2025/07/02/webb-and-chandra-image-of-bullet-cluster-maps-invisible-dark-matter/ #jameswebbspacetelescope #chandraxrayobservatory #bulletcluster #galaxycluster #cluster #Space #News #jwst #webb
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📸 Messier 109
Barred spiral galaxy M109 lies just beneath the Big Dipper in Ursa Major. Though small in our sky, it spans 120,000 light-years across at a distance of 60 million light-years. This view also shows possible satellite galaxies UGC 6969, UGC 6940, and UGC 6923.
📅 June 27, 2025
📷 Robert Eder
🔗 https://stellarsnap.space
#APOD #Messier109 #M109 #NGC3992 #BarredSpiral #UrsaMajor #GalaxyCluster #Astrophotography #StellarSnap #DeepSky #SatelliteGalaxies -
NASA’s Webb Reveals Galaxy Population Driving Cosmic Renovation ☀️✨
#Ast #Astrophysics #Galaxy #GalaxyCluster #GravitationalLensing #Reionization #SolarMagneticField #SolarMaximum
⏩ 2 new pictures and 1 new video from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=14&user=OptimusPrimeBot&ilshowall=1&offset=20250612130129
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A very deep (120 hours with 9 IR filters) Webb image of the #GalaxyCluster Abell S1063: https://www.esa.int/ESA_Multimedia/Images/2025/05/Webb_glimpses_the_distant_past - Webb’s deepest gaze on a single target to date showcases an incredible forest of lensing arcs around Abell S1063, which reveal distorted background galaxies at a range of cosmic distances, along with a multitude of faint galaxies and previously unseen features.
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Incredible new #JWST deep field (120 hours!) released by folks from ESA/NASA Webb teams.
Not only is nearly everything in this image a galaxy (the two spiky stars are not), but those curved arcs are images of galaxies beyond this cluster, which are projected and warped into our view thanks to the power of gravity!
It's called a gravitational lens. To visualise what's happening, take a look at this diagram.
There are distant galaxies that we can't normally see. There's also a galaxies between them and us, with lots of mass.
This mass warps space-time and bends the distant galaxy light towards us so we see them.
I am amazed. You should be amazed. This is a really epic image.
Galaxy image and alt-text credit: ESA/Webb, NASA & CSA, H. Atek, M. Zamani (ESA/Webb)
Diagram credit: NASA, ESA & L. Calçada
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One last question, if someone knows: Turner & Gott 1976 were on the right track with density-based clustering, why was this changed to single-linkage ("friends-of-friends") over the course of time? From what I understand now, it was a change for the worse...
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Directly Imaging the Cooling Flow in the Phoenix Cluster: https://arxiv.org/abs/2502.08619 -> Webb Maps Full Picture of How Phoenix #GalaxyCluster Forms Stars: https://webbtelescope.org/contents/news-releases/2025/news-2025-107
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in the #arXiv
Discovery of the Champagne Cluster 🥂
by Faik Bouhrik, Rodrigo Stancioli, and David Wittman
https://arxiv.org/abs/2501.09901#Cosmology #Astrophysics #Champagne #cluster #ChampagneCluster #galaxies #GalaxyCluster #Astrodon #science #STEM #news #Chandra #xray #telescope
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in the #arXiv
The Tale of Two Telescopes: How Hubble Uniquely Complements the James Webb Space Telescope: Galaxies
by Rogier A. Windhorst and co-authors
https://arxiv.org/abs/2410.01187#Hubble #HST #JWST #space #telescope #spacetelescope #Webb #galaxies #galaxycluster #astronomy #astrophysics #astrodon #universe #cosmology #science #STEM #technology #HubbleSpaceTelescope
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A detached double X-ray tail in the merging #GalaxyCluster Z8338 with a large double tail: https://academic.oup.com/mnras/article/525/1/1365/7239302?login=false -> NASA's Chandra Finds Galaxy Cluster That Crosses the Streams: https://chandra.si.edu/photo/2024/z8338/ and https://www.nasa.gov/image-article/nasas-chandra-finds-galaxy-cluster-that-crosses-the-streams/
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"Beads on a String" Star Formation Tied to one of the most Powerful #AGN Outbursts Observed in a Cool Core #GalaxyCluster: https://www.arxiv.org/abs/2312.06762 -> #BlackHole Fashions Stellar Beads on a String: https://chandra.si.edu/photo/2024/beads/ -> https://www.nasa.gov/image-article/stellar-beads-on-a-string/
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The Sardinia Radio Telescope, a 64-metre fully steerable radiotelescope located near San Basilio, Province of Cagliari, Sardinia, Italy, on the day of its inauguration in 2013.
A paper in #arXiv today reports on its observations of the Coma Cluster of galaxies: https://arxiv.org/abs/2402.07306
#astronomy #astrophysics #astrodon #telescope #Sardinia #radiotelescope #SRT #SardiniaRadiotelescope #Coma #cluster #galaxies #galaxycluster #galaxyclusters #observations #space #science #research #STEM #Italy
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Hey #GalaxyCluster people out there! I have a cone of #galaxies coords+spec-zs to find member gals for a cluster around a given centre.
Is there any good paper NOT using spherical infall/caustic-vel-modelling to find members? Method as agnostic as possible desired, as I do not want to put anything in the selection that I want to get out of the evaluation in the end...
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Gravitational lensing has to be one of the most visually striking phenomena in astronomy
Gravitational lensing is a phenomenon where a massive object bend the light of a distant source as it approaches the observer. Most often this takes the form of enormous galaxy clusters bending the light of even more distant galaxies into warped images of their true selves. They typically follow an arc around the massive object in the foreground like ripples in a pond.
Here's a few of my favourite gravitational lensing events.
Abel 1689 – Virgo
Abel 1689 is a one of the largest galaxy clusters in the known universe. It's located about 2.459 billion light-years away in constellation Virgo. Not only is this image visually beautiful, but the sheer number of gravitationally lensed galaxies across the entire image is just mind-blowing.
In 2008, one of the lensed galaxies, A1689-zD1, became known as the most distant galaxy from Earth based on a photometric redshift. 2008 also happens to be the same year the astronomy bug really bit me and it became one of my life-long passions.
You can find the original image file here.
PSZ1 G311.65-18.48 – Apus
PSZ1 G311.65-18.48 is a massive galaxy cluster located 4.6 billion light-years away in the constellation Apus. What's especially remarkable about this image is that it features a bright galaxy that's been lensed 12 separate times along four arcs. Three of these arcs are visible to the upper right of the cluster, while a fainter fourth arc is partially obscured by a bright foreground star to the bottom left of the cluster. This galaxy is almost 12 billion light-years away from Earth, which given its title as the brightest gravitationally lensed galaxy is quite a remarkable feat.
You can find the original image file here.
#astronomy #HubbleSpaceTelescope #galaxycluster #galaxies #supernova #gravitationallensing
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Astrophoto: Galaxy Cluster – Abell 2151 – 06/23 https://astrocamp.eu/en/astrophoto-galaxy-cluster-abell-2151-06-23/ Reprocessed 2024: Now … this reprocessing was really worth it. This one brought more galaxies to light than the one before.. … #Abell2151 #GalaxyCluster #clearskies
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A giant thin stellar stream in the Coma #GalaxyCluster: https://www.aanda.org/articles/aa/full_html/2023/11/aa46780-23/aa46780-23.html -> Astronomers spot giant stream of stars between galaxies: https://www.astronomie.nl/nieuws/en/astronomers-spot-giant-stream-of-stars-between-galaxies-3823
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Just saw the next news coverage about our recent MNRAS article on A3827!
@physorg_rss_bot
author Bob Yirka did a great job in writing:
https://phys.org/news/2023-10-theory-abell-hazy-askew-gravitationally.htmlBesides this, our article is freely available on MNRAS, check it out:
https://doi.org/10.1093/mnras/stad2800#astronomy #Astrodon #astrophysics #GravitationalLens #GalaxyCluster #cosmology
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The JWST Discovery of the Triply-imaged Type Ia "Supernova H0pe" and Observations of the #GalaxyCluster PLCK G165.7+67.0: https://arxiv.org/abs/2309.07326 -> JWST’s first triple-image supernova could save the Universe: https://bigthink.com/starts-with-a-bang/triple-lens-supernova-jwst/ - named #Supernova H0pe, it shows how #JWST plus #GravitationalLensing can be used to solve the greatest puzzle facing astronomy today, the #HubbleConstant tension.
