#quasars — Public Fediverse posts

Weekly Update from the Open Journal of Astrophysics 08/08/2026

Althouygh it’s holiday season for some, it’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further for papers, bringing the number in Volume 9 (2026) to 167 and the total so far published by OJAp up to 615.

I 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 was published on Tuesday 4th August in the folder Astrophysics of Galaxies with the title “Small-scale turbulence alongside large-scale turbulence in a z=1.87 star-forming galaxy with an outflowing wind, revealed by multi-point structure functions” by Itzhak Goldman (Afeka College, Israel). A previous study by the author found evidence of large and small scale turbulence in the star-forming galaxy CSWA13, suggesting that star clusters and large clumps within the galaxy could be driving this turbulence.

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/117036181269903989

The second paper for this week, published on Thursday 6th August in the folder Astrophysics of Galaxies, is “From Clumps to Sheets: Geometry Controls the Temperature PDF of Multi-Phase Gas” by Zirui Chen and S. Peng Oh (UC Santa Barbara, USA). This study uses 3D hydrodynamic simulations to show that the temperature probability distribution functions (PDFs) of multi-phase turbulent gas differ significantly under interstellar medium (ISM) and circumgalactic medium (CGM) conditions.

The overlay 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/117047322340826393

The third paper of the week, published on Thursday 6th August in folder Instrumentation and Methods for Astrophysics is “First Detection of Extensive Air Showers Using a Small-Aperture Fluorescence Telescope” by M. Zotov (M.V. Lomonosov Moscow State University, Russia) and 7 others based in Russia and Armenia. The study reports the first-ever detection of extensive air showers from ultra-high-energy cosmic rays using a compact fluorescence telescope, employing both conventional and deep learning analysis methods.

The overlay is here:

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

https://fediscience.org/@OJ_Astro/117047408583672745

The fourth and final paper of the week was published on Friday 7th August in the folder Cosmology and Nongalactic Astrophysics: “TDCOSMO XXVI: Uniform Lens Modeling of Eight Doubly Imaged Quasars“, by Ryan Brady (Stony Brook University, USA) and 9 others based all around the world, presents a new method for analyzing doubly imaged quasars using the Hubble Space Telescope, revealing that arc surface brightness is key to precision in mass model measurements.

The overlay is here:

The officially-accepted version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/117053056092162466

That’s all for this week. We have about a dozen more papers accepted and waiting for the authors to put the final version on arXiv, which they will presumably do when they’re back from holiday. I’ll do an update next weekend and we’ll see!

New in the #VirtualObservatory: “XQR-30 quasars absorption systems properties” by Davies R.L. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/289
#LineIntensities #Spectroscopy #IntergalacticMedium #Quasars

New in the #VirtualObservatory: “Euclid spectroscopy of quasars. 1.” by Euclid Coll.: Fu Y. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/711/A285
#Quasars #Spectroscopy #InfraredAstronomy #VisibleAstronomy

Weekly Update from the Open Journal of Astrophysics 11/07/2026

Back home to Maynooth, just in time for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 145 and the total so far published by OJAp up to 593.

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 7th July, is “The Information Content of Quasar Variability Light Curves: How Well Can we Infer Stochastic Model Parameters?” by Brendon Brewer (U. Auckland, NZ), Geraint F. Lewis (U. Sydney, AU), Xiang Yu & Yuan Li (Auckland). Published in the folder Astrophysics of Galaxies, this study suggests that quasar variability studies should focus on the short term volatility parameter, as it’s more informative than the variability timescale. Volatility decreases with redshift suggesting intrinsic effects.

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/116877118638227811

The second paper for this week, also published on Tuesday 7th July, but in the folder High-Energy Astrophysical Phenomena, is “Cygnus X-3 as a PeVatron and the LHAASO 2025 data” by Michael Kachelriess & E. Lammert (NTNU, Trondheim, Norway). This paper suggests that the high-mass X-ray binary Cygnus X-3 can accelerate cosmic rays beyond PeV energies, contributing to a photon flux peaking around PeV energies.

The overlay 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/116877369307135417

The third paper of the week, also published on Tuesday 7th July, but in the folder Cosmology and Nongalactic Astrophysics is “The DESI DR1 Peculiar Velocity Survey: growth rate measurements from galaxy and momentum correlation functions” by Ryan J Turner (Swinburne Institute of Technology, Australia) and 63 others from around the world. This paper analyzes local peculiar velocity and galaxy density fields to test cosmological models of gravity, finding results consistent with predictions from Planck+ΛCDM cosmology and general relativity.

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/116877601913437714

The fourth paper of the week, published on Wednesday 8th July in the folder Instrumentation and Methods for Astrophysics , is “Morphological Fingerprints of Forbush Decreases and Their Relation to Geomagnetic Storm Severity” by Juan Diego Perez Navarro and David Sierra Porta (Universidad Tecnológica de Bolívar, Colombia). This article introduces a graph-based method to analyze Forbush decreases (FDs), transient depressions in cosmic-ray flux, and uses network signatures to predict geomagnetic storm intensity.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116837827227415689

The fifth paper of the week, also published on Wednesday 8th July but in the folder Astrophysics of Galaxies, is “On the connection between galaxy orientation and halo absorption properties” by Rohan Venkat, Soo May Wee, and Hsiao-Wen Chen (U. Chicago, USA). This article investigates the azimuthal dependence of metal-line absorption in the circumgalactic medium of 87 isolated galaxies. The results show no significant correlation between absorption strength and azimuthal angle.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

The sixth paper of this week is “Searching for Periodicity in FRB 20240114A” by Jonathan I Katz (Washington U., USA). This was published on Thursday 9th July in the folder High-Energy Astrophysical Phenomena. The study described in this paper observed FRB 20240114A, an active Fast Radio Burst, but found no significant periodicity in its bursts, contradicting magnetar models predictions.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888362191860771

The seventh article for this week is “Multiphase gas in Circumgalactic cloud complexes: Insights from kiloparsec-scale Magnetohydrodynamic Turbulence Simulations” by Rajsekhar Mohapatra (Princeton U., USA), Alankar Dutta (MPA Garching, Germany) and Prateek Sharma (Indian Institute of Science, Bangalore). This -paper was also published on Thursday 9th July, in the folder Astrophysics of Galaxies. This paper uses high-resolution simulations to investigate the mass distribution of the circumgalactic medium (CGM), a diffuse gas surrounding a galaxy’s halo with small-scale clumps of cold gas forming in quiescent regions.

The overlay for this one is here:

You can find the final accepted version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888423374478219

The (penultimate) eighth article for this week is “Line-of-sight shear in SLACS strong lenses I: shear and mass model parametrisations” by Natalie B. Hogg (U. Cambridge, UK), Daniel Johnson (U. Montpellier, France), Anowar J. Shajib (U. Chicago, USA) and Julien Larena (Montpellier). This was also published on Thursday 9th July, but in the folder Cosmology and Nongalactic Astrophysics. This article studies models of 23 strong gravitational lenses to measure line-of-sight shear for the first time, providing potential new constraints on cosmological parameters.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888620656683811

The ninth and last article for this week is “Current and future constraints on the expansion history of the GREA model” by Irene Graziotti (INAF-Osservatorio Astronomico di Capodimonte, Italy), Chiara De Leo (Sapienza University of Rome, Italy) and Matteo Martinelli (INAF-Osservatorio Astronomico di Roma, Italy). This study explores the General Relativistic Entropic Acceleration (GREA) framework, comparing it to the standard description of the universe. Current data favors the standard model, but GREA remains competitive.

The overlay for this one is here:

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

https://fediscience.org/@OJ_Astro/116894079326256820

As you can see, it has been a bumper week, especially when you consider that there was no arXiv mailing om Monday July 6th owing to the July 4th holiday in the USA. I should have known this would happen while I was travelling!

Weekly Update from the Open Journal of Astrophysics 11/07/2026

Back home to Maynooth, just in time for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 145 and the total so far published by OJAp up to 593.

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 7th July, is “The Information Content of Quasar Variability Light Curves: How Well Can we Infer Stochastic Model Parameters?” by Brendon Brewer (U. Auckland, NZ), Geraint F. Lewis (U. Sydney, AU), Xiang Yu & Yuan Li (Auckland). Published in the folder Astrophysics of Galaxies, this study suggests that quasar variability studies should focus on the short term volatility parameter, as it’s more informative than the variability timescale. Volatility decreases with redshift suggesting intrinsic effects.

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/116877118638227811

The second paper for this week, also published on Tuesday 7th July, but in the folder High-Energy Astrophysical Phenomena, is “Cygnus X-3 as a PeVatron and the LHAASO 2025 data” by Michael Kachelriess & E. Lammert (NTNU, Trondheim, Norway). This paper suggests that the high-mass X-ray binary Cygnus X-3 can accelerate cosmic rays beyond PeV energies, contributing to a photon flux peaking around PeV energies.

The overlay 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/116877369307135417

The third paper of the week, also published on Tuesday 7th July, but in the folder Cosmology and Nongalactic Astrophysics is “The DESI DR1 Peculiar Velocity Survey: growth rate measurements from galaxy and momentum correlation functions” by Ryan J Turner (Swinburne Institute of Technology, Australia) and 63 others from around the world. This paper analyzes local peculiar velocity and galaxy density fields to test cosmological models of gravity, finding results consistent with predictions from Planck+ΛCDM cosmology and general relativity.

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/116877601913437714

The fourth paper of the week, published on Wednesday 8th July in the folder Instrumentation and Methods for Astrophysics , is “Morphological Fingerprints of Forbush Decreases and Their Relation to Geomagnetic Storm Severity” by Juan Diego Perez Navarro and David Sierra Porta (Universidad Tecnológica de Bolívar, Colombia). This article introduces a graph-based method to analyze Forbush decreases (FDs), transient depressions in cosmic-ray flux, and uses network signatures to predict geomagnetic storm intensity.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116837827227415689

The fifth paper of the week, also published on Wednesday 8th July but in the folder Astrophysics of Galaxies, is “On the connection between galaxy orientation and halo absorption properties” by Rohan Venkat, Soo May Wee, and Hsiao-Wen Chen (U. Chicago, USA). This article investigates the azimuthal dependence of metal-line absorption in the circumgalactic medium of 87 isolated galaxies. The results show no significant correlation between absorption strength and azimuthal angle.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

The sixth paper of this week is “Searching for Periodicity in FRB 20240114A” by Jonathan I Katz (Washington U., USA). This was published on Thursday 9th July in the folder High-Energy Astrophysical Phenomena. The study described in this paper observed FRB 20240114A, an active Fast Radio Burst, but found no significant periodicity in its bursts, contradicting magnetar models predictions.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888362191860771

The seventh article for this week is “Multiphase gas in Circumgalactic cloud complexes: Insights from kiloparsec-scale Magnetohydrodynamic Turbulence Simulations” by Rajsekhar Mohapatra (Princeton U., USA), Alankar Dutta (MPA Garching, Germany) and Prateek Sharma (Indian Institute of Science, Bangalore). This -paper was also published on Thursday 9th July, in the folder Astrophysics of Galaxies. This paper uses high-resolution simulations to investigate the mass distribution of the circumgalactic medium (CGM), a diffuse gas surrounding a galaxy’s halo with small-scale clumps of cold gas forming in quiescent regions.

The overlay for this one is here:

You can find the final accepted version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888423374478219

The (penultimate) eighth article for this week is “Line-of-sight shear in SLACS strong lenses I: shear and mass model parametrisations” by Natalie B. Hogg (U. Cambridge, UK), Daniel Johnson (U. Montpellier, France), Anowar J. Shajib (U. Chicago, USA) and Julien Larena (Montpellier). This was also published on Thursday 9th July, but in the folder Cosmology and Nongalactic Astrophysics. This article studies models of 23 strong gravitational lenses to measure line-of-sight shear for the first time, providing potential new constraints on cosmological parameters.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116888620656683811

The ninth and last article for this week is “Current and future constraints on the expansion history of the GREA model” by Irene Graziotti (INAF-Osservatorio Astronomico di Capodimonte, Italy), Chiara De Leo (Sapienza University of Rome, Italy) and Matteo Martinelli (INAF-Osservatorio Astronomico di Roma, Italy). This study explores the General Relativistic Entropic Acceleration (GREA) framework, comparing it to the standard description of the universe. Current data favors the standard model, but GREA remains competitive.

The overlay for this one is here:

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

https://fediscience.org/@OJ_Astro/116894079326256820

As you can see, it has been a bumper week, especially when you consider that there was no arXiv mailing om Monday July 6th owing to the July 4th holiday in the USA. I should have known this would happen while I was travelling!

Découverte de 31 quasars extrêmement lointains grâce à Euclid
https://www.ca-se-passe-la-haut.fr/2026/07/decouverte-de-31-quasars-extremement.html
#science #astronomie #astrophysique #quasars #télescope #satellite #Euclid #ASE #cosmologie #trounoir #galaxie

Découverte de 31 quasars extrêmement lointains grâce à Euclid
https://www.ca-se-passe-la-haut.fr/2026/07/decouverte-de-31-quasars-extremement.html
#science #astronomie #astrophysique #quasars #télescope #satellite #Euclid #ASE #cosmologie #trounoir #galaxie

What is new in the Universe, is actually very old!

The European Space Agency’s Euclid space telescope has discovered 31 of the most ancient quasars ever found.

Two of these galaxy cores EUCL J172902.75+641018.1 and EUCL J125308.55+705432.3 are powered by gargantuan black holes, and are the earliest quasars yet observed in cosmic history.

Both lie just over 13 billion light-years away, and emerged during the Universe’s first 670 million years – just 5% of its current age. https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_discovers_the_most_ancient_quasar_in_the_Universe #EU #Euclid #SpaceTelescope #Space #Universe #Astronomy #Quasars #BlackHoles #Galaxy #CosmicHistory

What is new in the Universe, is actually very old!

The European Space Agency’s Euclid space telescope has discovered 31 of the most ancient quasars ever found.

Two of these galaxy cores EUCL J172902.75+641018.1 and EUCL J125308.55+705432.3 are powered by gargantuan black holes, and are the earliest quasars yet observed in cosmic history.

Both lie just over 13 billion light-years away, and emerged during the Universe’s first 670 million years – just 5% of its current age. https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_discovers_the_most_ancient_quasar_in_the_Universe #EU #Euclid #SpaceTelescope #Space #Universe #Astronomy #Quasars #BlackHoles #Galaxy #CosmicHistory

A collection of newfound objects discovered by the Euclid telescope more than doubles the number of known quasars from the universe's first billion years.

https://www.livescience.com/space/black-holes/euclid-telescope-discovers-the-2-most-ancient-monster-black-holes-in-the-universe-each-brighter-than-a-trillion-suns

#BlackHoles #quasars #EuclidTelescope #astronomy

A collection of newfound objects discovered by the Euclid telescope more than doubles the number of known quasars from the universe's first billion years.

https://www.livescience.com/space/black-holes/euclid-telescope-discovers-the-2-most-ancient-monster-black-holes-in-the-universe-each-brighter-than-a-trillion-suns

#BlackHoles #quasars #EuclidTelescope #astronomy

#TachyonBeam #astronomy #ESA #SMBH #quasars #Euclid

An article published in the journal "Astronomy & Astrophysics" reports the discovery of 31 new primordial quasars, including the two oldest known so far. A team of researchers used observations conducted with ESA's Euclid space telescope as part of the Euclid Wide Survey to find quasars we see as they were when the universe was no more than 800 million years old.

https://english.tachyonbeam.com/2026/07/07/31-new-primordial-quasars-discovered-thanks-to-the-euclid-space-telescope/

#TachyonBeam #astronomy #ESA #SMBH #quasars #Euclid

An article published in the journal "Astronomy & Astrophysics" reports the discovery of 31 new primordial quasars, including the two oldest known so far. A team of researchers used observations conducted with ESA's Euclid space telescope as part of the Euclid Wide Survey to find quasars we see as they were when the universe was no more than 800 million years old.

https://english.tachyonbeam.com/2026/07/07/31-new-primordial-quasars-discovered-thanks-to-the-euclid-space-telescope/

Euclid Discovery of 31 new #quasars at 6.6 < z < 7.8: https://www.aanda.org/articles/aa/full_html/2026/07/aa58883-26/aa58883-26.html -> Keck Observatory and ESA’s Euclid mission double the known population, including the two most distant quasars ever found / Euclid discovers the most ancient quasar in the Universe: https://keckobservatory.org/ancient-quasars/ / https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_discovers_the_most_ancient_quasar_in_the_Universe

Euclid Discovery of 31 new #quasars at 6.6 < z < 7.8: https://www.aanda.org/articles/aa/full_html/2026/07/aa58883-26/aa58883-26.html -> Keck Observatory and ESA’s Euclid mission double the known population, including the two most distant quasars ever found / Euclid discovers the most ancient quasar in the Universe: https://keckobservatory.org/ancient-quasars/ / https://www.esa.int/Science_Exploration/Space_Science/Euclid/Euclid_discovers_the_most_ancient_quasar_in_the_Universe

Découverte des plus anciens quasars de l’Univers, un casse-tête cosmique
https://ici.radio-canada.ca/nouvelle/2267170/euclid-esa-quasars-univers-plus-anciens-decouverte
#science #astronomie #astrophysique #quasars #découverte #télescope #Euclid #ASE #Univers #luminosité #lumièrev #ESA

Découverte des plus anciens quasars de l’Univers, un casse-tête cosmique
https://ici.radio-canada.ca/nouvelle/2267170/euclid-esa-quasars-univers-plus-anciens-decouverte
#science #astronomie #astrophysique #quasars #découverte #télescope #Euclid #ASE #Univers #luminosité #lumièrev #ESA

ESA's Euclid Telescope Spots The Oldest Quasars Yet Since Big Bang

https://web.brid.gy/r/https://in.mashable.com/science/111684/esas-euclid-telescope-spots-the-oldest-quasars-yet-since-big-bang

ESA's Euclid Telescope Spots The Oldest Quasars Yet Since Big Bang

https://fed.brid.gy/r/https://in.mashable.com/science/111684/esas-euclid-telescope-spots-the-oldest-quasars-yet-since-big-bang

The two papers can be read as open access publications without paywall:

Discovery paper: Yang et al., 2026, A&A, 711, 104 (https://www.aanda.org/10.1051/0004-6361/202658883)

First follow-up analysis: Belladitta et al., accepted for publication in A&A (https://doi.org/10.1051/0004-6361/202659319)

#ESAEuclid #Euclid #ESA #astronomy #quasars #blackholes

The two papers can be read as open access publications without paywall:

Discovery paper: Yang et al., 2026, A&A, 711, 104 (https://www.aanda.org/10.1051/0004-6361/202658883)

First follow-up analysis: Belladitta et al., accepted for publication in A&A (https://doi.org/10.1051/0004-6361/202659319)

#ESAEuclid #Euclid #ESA #astronomy #quasars #blackholes

With this first collection, #Euclid starts dominating the search for early Universe #quasars. This is no wonder: Euclid's wide survey provides unprecedented sensitivity at wavelengths into the near-infrared, which are key to identifying these rare accreting early black holes.

Forecasts predict that in Euclid data even earlier quasars should be found: likely beyond z=8 (650 million years after the Big Bang) and possibly even z=9 (550 million years).

#astronomy #ESAEuclid #ESA #blackholes

With this first collection, #Euclid starts dominating the search for early Universe #quasars. This is no wonder: Euclid's wide survey provides unprecedented sensitivity at wavelengths into the near-infrared, which are key to identifying these rare accreting early black holes.

Forecasts predict that in Euclid data even earlier quasars should be found: likely beyond z=8 (650 million years after the Big Bang) and possibly even z=9 (550 million years).

#astronomy #ESAEuclid #ESA #blackholes

New in the #VirtualObservatory: “QSOs at z~4 from Subaru/HSC wide field & BH masses” by He W. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/962/152
#Quasars #BlackHoles #VisibleAstronomy #Spectroscopy

New in the #VirtualObservatory: “Radio-loudness stat. of QSOs from Quaia-VLASS” by Arsenov N. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/280/23
#AbsoluteMagnitude #InterstellarReddening #Quasars #RadioSources

New in the #VirtualObservatory: “VST ATLAS QSO survey I photometric study” by Eltvedt A.M. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/521/3384
#InfraredAstronomy #VisibleAstronomy #Photometry #Quasars

New in the #VirtualObservatory: “MGQPC photo-z and high-probability pair catalogs” by Zhu X. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A191
#Redshifted #VisibleAstronomy #Quasars

New in the #VirtualObservatory: “Wide-sep. lensed QSOs + dual-QSO cand. from CatNorth” by Wu D. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A180
#GravitationalLensing #VisibleAstronomy #Quasars #GalaxyClusters

New in the #VirtualObservatory: “New BgVrRI light curves of QSO 2237+0305” by Shalyapin V.N. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A70
#GravitationalLensing #Quasars #VisibleAstronomy #CcdPhotometry

New in the #VirtualObservatory: “ZTF LC analysis of Fermi LAT (4LAC-DR3) AGNs” by Xiong D. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/279/3
#RadioGalaxies #GammaRayAstronomy #Photometry #Quasars

New in the #VirtualObservatory: “Supermassive BH with accretion rates in AGN. XIV.” by Hu C. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/278/61
#Redshifted #Spectroscopy #Quasars #ActiveGalacticNuclei

Extreme Galaxy-scale Outflows Are Frequent among Luminous Early Quasars: https://arxiv.org/abs/2509.08793 -> How #quasars shut down star formation in the early universe: https://news.arizona.edu/news/cosmic-blowtorches-how-quasars-shut-down-star-formation-early-universe

Extreme Galaxy-scale Outflows Are Frequent among Luminous Early Quasars: https://arxiv.org/abs/2509.08793 -> How #quasars shut down star formation in the early universe: https://news.arizona.edu/news/cosmic-blowtorches-how-quasars-shut-down-star-formation-early-universe

How Super-Quasars Shaped Early Galaxies and Confounded the JWST
https://atlas.whatip.xyz/post.php?slug=how-super-quasars-shaped-early-galaxies-and-confounded-the-jwst
<p>Extremely powerful quasars in the early Universe drove star-forming gas out of their galaxies
#galaxies #universe #quasars #shaped

Estudos recentes mostram que os quasars, objetos luminosos e energéticos, são fundamentais na formação e evolução de galáxias antigas, pois sua energia pode interromper a formação de novas estrelas, um fenômeno conhecido como "quenching".

🔗 https://omniletters.com/quasars-influenciam-galaxias/

#quasars #galaxias #universo #formacaoestelar #ciencia

New in the #VirtualObservatory: “Kilioparsec morphology OIII catalog” by Escott E.L. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/547/G274
#Quasars #InfraredAstronomy #RadioSources #ActiveGalacticNuclei

New in the #VirtualObservatory: “7918 blazar-selected AGN CAZ catalog and LC” by Kouch P.M. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A382
#VisibleAstronomy #RadioSources #Quasars #ActiveGalacticNuclei

New in the #VirtualObservatory: “KVN CLEAN images of PKS 1222+216” by Jo Y. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/708/A339
#GammaRayAstronomy #RadioSources #Quasars

Le télescope Mayall 4 m a produit la plus grande carte 3D haute résolution de l'Univers, traçant les positions de plus de 47 millions de galaxies et de quasars.
https://www.sci.news/astronomy/desi-universe-3d-map-14702.html
#astronomie #astrophysique #science #espace #télescope #cartographie #cartography #carte #maps #Univers #cosmologie #galaxies #quasars #DESI #étoiles

#Lensed #Quasars are extremely distant and luminous active galactic nuclei (AGNs) whose light is bent, distorted, and magnified by the gravity of a foreground massive galaxy or galaxy cluster—a phenomenon known as gravitational lensing.

https://knowledgezone.co.in/kbits/69bbe9e3ad32c9d63dfe282f

NASA’s Webb Delivers Unprecedented Look Into Heart of Circinus Galaxy https://science.nasa.gov/missions/webb/nasas-webb-delivers-unprecedented-look-into-heart-of-circinus-galaxy/ #NASA #ActiveGalaxies #Astrophysics #BlackHoles #Galaxies #GalaxiesStarsBlackHoles #GoddardSpaceFlightCenter #JamesWebbSpaceTelescopeJWST #Quasars #ScienceResearch #TheUniverse

NASA’s Webb Delivers Unprecedented Look Into Heart of Circinus Galaxy https://science.nasa.gov/missions/webb/nasas-webb-delivers-unprecedented-look-into-heart-of-circinus-galaxy/ #NASA #ActiveGalaxies #BlackHoles #JamesWebbSpaceTelescopeJWST #Quasars

NASA’s Webb Delivers Unprecedented Look Into Heart of Circinus Galaxy

https://web.brid.gy/r/https://science.nasa.gov/missions/webb/nasas-webb-delivers-unprecedented-look-into-heart-of-circinus-galaxy/

I love #Quasars! This is 3C 273, brightest in the sky, by #HST #Hubble, 2.5 billion light-years away. The bottom blocks out the supermassive #BlackHole showing more detail. The "L" is a jet, possibly from a disrupted dwarf galaxy. #Science #Astronomy #Space. See: esahubble.org/images/opo24...

Quasar Lifetime Measurements from Extended Lyα Nebulae at z ∼ 6: https://iopscience.iop.org/article/10.3847/1538-4357/adf6dd -> Are #Quasars Growing in Secret? https://aasnova.org/2025/09/22/are-quasars-growing-in-secret/

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

Weekly Update from the Open Journal of Astrophysics – 30/08/2025

Once again 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 three new papers, which brings the number in Volume 8 (2025) up to 125, and the total so far published by OJAp up to 360.

The first paper to report this week is “Large-scale surveys of the quasar proximity effect” by Rupert Croft, Patrick Shaw & Ann-Marsha Alexis (Carnegie Mellon University; CMU), Nianyi Chen (Princeton), Yihao Zhou & Tiziana Di Matteo (CMU), Simeon Bird (UC Riverside), Patrick Lachance (CMU), and Yueying Ni (Harvard). This paper was published on Monday 25th August in the folder Cosmology and NonGalactic Astrophysics. It presents a CDM-based halo model of the quasar proximity effect, tested on quasar Lyman-alpha spectra from the ASTRID cosmological simulation, including self-consistent formation of quasar black holes and the intergalactic medium.

The overlay is here:

You can make this larger by clicking on it, as you can with all the overlays below. The officially accepted version of this paper can be found on the arXiv here.

The second paper this week, also published on Monday 25th August, but in the folder Astrophysics of Galaxies, is “Redshift evolution of Lyman continuum escape fraction after JWST” by Andrea Ferrara (Pisa), M. Giavalisco (UMass Amherst), L. Pentericci (Rome), E. Vanzella (Bologna), A. Calabrò (Rome) and M. Llerena (Rome). This paper is about the Attenuation-Free Model (AFM) for galaxies, in which radiation-driven outflows develop once the galaxy specific star formation rate exceeds a certain level, which is tested on data with positive results. The overlay is here:

You can find the officially accepted version on arXiv here.

The third and final paper this week is “Primordial black holes in cosmological simulations: growth prospects for supermassive black holes” by Lewis R Prole, John A Regan, Daxal Mehta & Peter Coles (National University of Ireland, Maynooth) and Pratika Dayal (Groningen, NL). This one was published in Astrophysics of Galaxies folder on Thursday 28th August 2025. You can read more about this paper here: basically it studies the growth of primordial black holes in the early Universe using numerical simulations, with implications for the subsequent formation of massive black holes.

The overlay is here:

You can find the officially accepted version of this one on arXiv here.

And that’s all the papers for this week. It’s still a bit slow as we emerge from the summer vacations, but I expect things will start to pick up from now on.

#arXiv250403848v2 #arXiv250510619v2 #arXiv250611233v2 #AstrophysicsOfGalaxies #AttenuationFreeModel #CosmologyAndNonGalacticAstrophysics #DiamondOpenAccess #DiamondOpenAccessPublishing #JWST #LymanContinuum #massiveBlackHoles #OpenJournalOfAstrophysics #primordialBlackHoles #ProximityEffect #quasars #TheOpenJournalOfAstrophysics

Why on Earth is the planet’s day getting shorter?
#Space #Earth #Time #Physics #AtomicClocks #Quasars #EarthRotation #ShortestDay #Timekeeping #AtomicClocks #GPS #Astronomy #SpaceScience #Geophysics #EarthOrbit #ClimateChange #MoonEffects
https://the-14.com/why-on-earth-is-the-planets-day-getting-shorter/

Cosmography archives

Large-scale density inhomogeneities in the Universe

by Martin Rees and Dennis Sciama (1968)
https://www.nature.com/articles/217511a0

#Cosmology #Cosmography #Universe #CosmographyArchives #MartinRees #DennisSciama #Nature #Science #Cambridge #quasars