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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...

A Hubble Space Telescope image of the core of quasar 3C 273. A coronagraph on Hubble blocks out the glare coming from the supermassive black hole at the heart of the quasar. This allows astronomers to see unprecedented details near the black hole such as weird filaments, lobes, and a mysterious L-shaped structure, probably caused by small galaxies being devoured by the black hole. Located 2.5 billion light-years away, 3C 273 is the first quasar (quasi-stellar object) ever discovered, in 1963. NASA, ESA, Bin Ren (Université Côte d’Azur/CNRS) John Bahcall (IAS)

New in the #VirtualObservatory: “AllBRICQS bright QSOs in the Northern Hemisphere” by Choi Y. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/280/73
#Quasars #InfraredAstronomy #ProperMotions #TwoColorDiagrams

New in the #VirtualObservatory: “Quaia, the Gaia-unWISE Quasar catalog” by Storey-Fisher K. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/964/69
#Redshifted #Quasars #VisibleAstronomy #Spectroscopy

New in the #VirtualObservatory: “MUSE-ALMA VII 3672 galaxies in quasars fields” by Peroux C. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/5618
#Galaxies #Quasars #Astrometry #Photometry

New in the #VirtualObservatory: “Nine quasar pair fields JCMT/SCUBA-2 data” by Herwig E. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A17
#MillimeterAstronomy #Quasars #GalaxyClusters #SubmillimeterAstronomy

New in the #VirtualObservatory: “QUAC. QUasar Atlas and Catalogue” by QUAC collaboration
https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/298
#Quasars #BlLacertaeObjects #GravitationalLensing #Redshifted

New in the #VirtualObservatory: “Stripe 82 QSOs ALMA Band 7 detections” by Hatziminaoglou E. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A183
#MillimeterAstronomy #SubmillimeterAstronomy #Photometry #Quasars

New in the #VirtualObservatory: “eROSITA-selected SDSS-V Galaxies” by Pulatova N.G. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A67
#SeyfertGalaxies #Quasars #VisibleAstronomy #Catalogs

New in the #VirtualObservatory: “A uniform Hbeta RM analysis of AGNs” by Wang S. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/275/13
#VisibleAstronomy #AstronomicalReferenceMaterials #ActiveGalacticNuclei #Quasars

Ancient Quasars Reveal Secrets of Early Galaxy Growth

Unravel the mysteries of distant, powerful objects! Explore how scientists use quasar observations to map the early universe and understand its evolution. Discover fascinating insights into black holes & galactic formation – a cosmic journey awaits! #astronomy #cosmology #quasars

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

A black hole is growing at one of the fastest rates ever recorded, according to a team of…
#NewsBeep #News #Headlines #&BlackHolesResearch #Astrophysics #BlackHoles #ChandraX-RayObservatory #Galaxies #Latvia #LV #MarshallAstrophysics #MarshallSpaceFlightCenter #Quasars #Science&Research #Stars #SupermassiveBlackHoles #TheUniverse
https://www.newsbeep.com/131161/

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

New in the #VirtualObservatory: “A sample of Type 1 quasars with CIV & Hbeta data” by Ha T. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/950/97
#ActiveGalacticNuclei #Quasars #Redshifted #LineIntensities

New in the #VirtualObservatory: “GNIRS-DQS II: CIV and MgII sp. measurements” by Dix C. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/950/96
#Quasars #VisibleAstronomy #InfraredAstronomy #Surveys

New in the #VirtualObservatory: “Missing FeII bump in faint JWST AGNs” by Trefoloni B. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/700/A203
#Spectroscopy #Quasars #ActiveGalacticNuclei #ChemicalAbundances

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

Weekly Update from the Open Journal of Astrophysics – 16/08/2025

It’s time once again for the usual update of papers published at the Open Journal of Astrophysics which I do every Saturday. Since the last update we have published two new papers, which brings the number in Volume 8 (2025) up to 116, and the total so far published by OJAp up to 351. The summer lull we always expected is now upon us, so this will be a shorter post than we have had of late.

The first paper to report this week is “The reflex instability: exponential growth of a large-scale mode in astrophysical discs” by Aurélien Crida (Université Côte d’Azur, France), Clément Baruteau (Université de Toulouse, France), Jean-François Gonzalez (Universite Claude Bernard Lyon 1, France), Frédéric Masset (Universidad Nacional Autonoma de México) and Paul Segretain, Philippine Griveaud, Héloïse Méheut & Elena Lega (Université Côte d’Azur). This paper was published on Tuesday August 12th 2025 in the folder marked “Earth and Planetary Astrophysics“. It discusses a exponentially-growing instability in gas discs around stars caused by the motion of the central star in response to the disc.

The overlay – which you can make larger by clicking on it – is here:

You can find the officially accepted version on arXiv here.

The other paper this week, published in the folder Cosmology and Nongalactic Astrophysics, is “The galaxy-IGM connection in THESAN: the physics connecting the IGM Lyman-alpha opacity and galaxy density in the reionization epoch” by Enrico Garaldi (University of Tokyo, Japan), Verena Bellscheidt (Technical University of Munich, Germany), Aaron Smith (York University, Canada) and Rahul Kannan (University of Texas at Dallas, USA). It presents a study of the relation between the Lyman-alpha effective optical depth of quasar sightlines and the distribution of galaxiesas as a probe of ionized regions around sources of photons. It was published on Wednesday August 13th 2025.

The overlay is here:

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

That concludes the papers for this week. I’ll do another update next weekend, though I expect things will remain relatively quiet until September.

#arXiv241002853v2 #arXiv250807859v1 #circumstellarDisks #CosmologyAndNonGalacticAstrophysics #DiamondOpenAccess #DiamondOpenAccessPublishing #EarthAndPlanetaryAstrophysics #LymanAlphaAbsorption #OpenJournalOfAstrophysics #quasars #reionization #TheOpenJournalOfAstrophysics #THESANSimulations