đ Limits on the 21 cm Power Spectrum at z = 6.5â7.0 from Murchison WideâŠ
Quicklook:
Nunhokee, C. D. et al. (2025) · The Astrophysical Journal
Reads: 284 · Citations: 19
DOI: 10.3847/1538-4357/adda45
đ https://ui.adsabs.harvard.edu/abs/2025ApJ...989...57N/abstract
#Astronomy #Astrophysics #Cosmology #Reionization #HILineEmission
Improved Limits on the 21 cm Signal at z = 6.5â7.0 (the Epoch of #Reionization) with the Murchison Widefield Array Using Gaussian Information: https://iopscience.iop.org/article/10.3847/1538-4357/adff80 -> Astronomers hunting for evidence of the light from the first stars and galaxies have found that the Universe was warm, rather than cold, before it âlit upâ: https://www.icrar.org/eor-limit/
Weekly Update from the Open Journal of Astrophysics â 16/08/2025
Itâs 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 âThe reflex instability: exponential growth of a large-scale mode in astrophysical discsâ by AurĂ©lien Crida (UniversitĂ© CĂŽte dâAzur, France), ClĂ©ment Baruteau (UniversitĂ© de Toulouse, France), Jean-François Gonzalez (Universite Claude Bernard Lyon 1, France), FrĂ©dĂ©ric Masset (Universidad Nacional Autonoma de MĂ©xico) and Paul Segretain, Philippine Griveaud, HĂ©loĂŻse MĂ©heut & Elena Lega (UniversitĂ© CĂŽte dâAzur). This paper was published on Tuesday August 12th 2025 in the folder marked âEarth and Planetary Astrophysicsâ. 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 â which you can make larger by clicking on it â 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 âThe galaxy-IGM connection in THESAN: the physics connecting the IGM Lyman-alpha opacity and galaxy density in the reionization epochâ 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. Iâll 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
JWST discovers how weâre able to see the Universe at all
It's only because all of the neutral atoms in intergalactic space became ionized that we can see so far away through space.
JWST, at last, has found who the culprit is.
bigthink.com/starts-with-...
#space #astronomy #jwst #reionization
JWST discovers how we're able ...
Tiny galaxies with massive impactâWebb reveals who really cleared the cosmic fog. #JamesWebb #Reionization #GalaxyPower
https://geekoo.news/tiny-galaxies-unmasked-as-cosmic-renovators-by-webb/
NASAâs Webb Reveals Galaxy Population Driving Cosmic Renovation âïžâš
#Ast #Astrophysics #Galaxy #GalaxyCluster #GravitationalLensing #Reionization #SolarMagneticField #SolarMaximum
â© 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
Weekly Update from the Open Journal of Astrophysics â 12/04/2025
Time for the weekly Saturday morning update of papers published at the Open Journal of Astrophysics. Since the last update we have published four new papers, which brings the number in Volume 8 (2025) up to 37 and the total so far published by OJAp up to 272.
In chronological order of publication, the four papers published this week, with their overlays, are as follows. You can click on the images of the overlays to make them larger should you wish to do so.
The first paper to report is âSearching for new physics using high precision absorption spectroscopy; continuum placement uncertainties and the fine structure constant in strong gravityâ by Chung-Chi Lee (Big Questions Institute (BQI), Sydney, Australia), John K. Webb (Cambridge, UK), Darren Dougan (BQI), Vladimir A. Dzuba & Victor V. Flambaum (UNSW, Australia) and Dinko MilakoviÄ (Trieste, Italy).
This presents a discussion of the problem of continuum placement in high-resolution spectroscopy, which impacts significantly on fine structure constant measurements, and a method for mitigating its effects. The paper is in the folder Solar and Stellar Astrophysics and was published on Tuesday 8th April 2025. The overlay is here:
You can find the officially-accepted version of the paper on arXiv here.
The second paper to announce, also published on 8th April 2025, is âDeciphering Spatially Resolved Lyman-Alpha Profiles in Reionization Analogs: The Sunburst Arc at Cosmic Noonâ by Erik Solhaug (Chicago, USA), Hsiao-Wen Chen (Chicago), Mandy C. Chen (Chicago), Fakhri Zahedy (University of North Texas), Max Gronke (MPA Garching, Germany), Magdalena J. Hamel-Bravo (Swinburne, Australia), Matthew B. Bayliss (U. Cincinatti), Michael D. Gladders (Chicago), SebastiĂĄn LĂłpez (Universidad de Chile), NicolĂĄs Tejos (Universidad CatĂłlica de ValparaĂso, Chile).
This paper, which presents a study of the Lyman-alpha emission properties of a gravitationally-lensed galaxy at redshift z=2.37, appears in the folder Astrophysics of Galaxies. It was published
You can read the officially accepted version of this paper on arXiv here.
The third paper of the week is âOn the progenitor of the type Ia supernova remnant 0509-67.5â by Noam Soker (Technion, Haifa, Israel). This one was published on Wednesday 9th April 2025 in the folder High-Energy Astrophysical Phenomena. The author discusses possible ideas for the origin of a supernova that exploded inside a planetary nebula.
Here is the overlay:
You can find the officially accepted version of this paper on arXiv here.
Last (but certainly) not least for this week, published on April 11th 2025, we have âAre Models of Strong Gravitational Lensing by Clusters Converging or Diverging?â by Derek Perera (U. Minnesota), John H Miller Jr & Liliya L. R. Williams (U. Minnesota, USA), Jori Liesenborgs (Hasselt U., Belgium), Allison Keen (U. Minnesota), Sung Kei Li (Hong Kong University), Marceau Limousin (Aix Marseille Univ., France). This papers study various models of a strong gravitational lensing system, the results suggesting that lens models are neither converging to nor diverging from a common solution for this system, regardless of method.
Here is the overlay:
The official published version can be found on the arXiv here.
Thatâs all the papers for this week. By way of a postscript Iâll just mention that the gremlins that have affected submissions to Crossref (which we rely on for registering the article metadata) have now been resolved and normal services have been restored.
#arXiv240910604v5 #arXiv241001849v2 #arXiv241105083v2 #arXiv250304709v2 #AstrophysicsOfGalaxies #CosmicNoon #DiamondOpenAccess #DiamondOpenAccessPublishing #fineStructureConstant #HighEnergyAstrophysicalPhenomena #HighResolutionSpectroscopy #PlanetaryNebula #reionization #SolarAndStellarAstrophysics #strongGravitationalLensing #SupernovaRemnant #TheOpenJournalOfAstrophysics
#astronomy #cosmology #JWST #galaxies #reionization
An article published in the journal "Nature" reports the results of observations of the primordial galaxy JADES-GS-z13-1. A team of researchers used the James Webb Space Telescope to examine this galaxy, estimating that it dates back to about 330 million years after the Big Bang. The surprise came from the so-called Lyman-alpha radiation because it was much stronger than expected from a galaxy of that era.
Witnessing the onset of #reionization through Lyman-α emission at redshift 13: https://www.nature.com/articles/s41586-025-08779-5 -> NASA's Webb Sees Galaxy Mysteriously Clearing Fog of Early Universe: https://webbtelescope.org/contents/news-releases/2025/news-2025-116
Weekly Update at the Open Journal of Astrophysics â 22/03/2025
Itâs 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 âHawking Radiation from non-evaporating primordial black holes cannot enable the formation of direct collapse black holesâ by Jonathan Regan, Marios Kalomenopoulos and Kelly Kosmo OâNeil 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 âFirst Light and Reionization Epoch Simulations (FLARES) â XV: The physical properties of super-massive black holes and their impact on galaxies in the early universeâ 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.
Thatâs all for this week. Itâs 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 wonât 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
My own laptop is still with the menders but Iâve managed to borrow one until I get it back so I donât get too far behind. Anyway, itâs Saturday morning, and once again time to post another update relating to the Open Journal of Astrophysics. Since the last update we have published two more papers, taking the count in Volume 7 (2024) up to 54 and the total published by OJAp up to 169. There was one less arXiv update than usual last week, owing to the holiday on July 4th, so a couple of papers have been delayed.
The first paper of the most recent pair, published on July 3rd 2024, is âRecovering 21cm Monopole Signals Without Smoothnessâ by Rugved Pund & AnĆŸe Slosar (Stony Brook, NY, USA) and Aaron Parsons (Berkeley, CA, USA) . This paper presents a new method for identifying the âDark Agesâ trough contribution to the monopole of the 21cm radiation background that does not rely on the assumption that the spectrum is smooth. The paper is in the folder marked Cosmology and NonGalactic Astrophysics.
Here is a screen grab of the overlay which includes the abstract:
You can click on the image of the overlay to make it larger should you wish to do so. You can find the officially accepted version of the paper on the arXiv here.
The second paper, also published on 3rd July, has the title âLtU-ILI: An All-in-One Framework for Implicit Inference in Astrophysics and Cosmologyâ. There are fifteen authors with primary affiliations as follows: Matthew Ho (IAP, Paris, France), Deaglan J. Bartlett (IAP, Paris, France), Nicolas Chartier (Seoul National University, Korea), Carolina Cuesta-Lazaro (Cfa, Harvard, USA), Simon Ding (IAP, Paris, France), Axel Lapel (IAP, Paris, France), Pablo Lemos (UniversitĂ© de MontrĂ©al, Canada), Christopher C. Lovell (University of Portsmouth, UK), T. Lucas Makinen (Imperial College, London, UK), Chirag Modi (Flatiron Institute, NY, USA), Viraj Pandya (Columbia University, NY, USA), Shivam Pandey (Columbia University, NY, USA), Lucia A. Perez (Flatiron Institute, NY, USA), Benjamin Wandelt (IAP, Paris, France), and Greg L. Bryan (Sorbonne UniversitĂ©, Paris, France).
This paper, which is in the folder marked Instrumentation and Methods for Astrophysics, presents a suite of software for rapid, user-friendly, and cutting-edge inference using machine learning in astrophysics and cosmology. The software can be found on Github here.
Here is a screen grab of the overlay which includes the abstract:
You can click on the image of the overlay to make it larger should you wish to do so. You can find the officially accepted version of the paper on the arXiv here.
That concludes this weekâs update. No doubt Iâll have more for you next week!
https://telescoper.blog/2024/07/06/two-new-publications-at-the-open-journal-of-astrophysics-12/
#21cmRadiationBackground #arXiv231006134v5 #arXiv240205137v2 #CosmologyAndNonGalacticAstrophysics #DarkAges #ImplicitLikelihoodInference #InstrumentationAndMethodsForAstrophysics #OJAp #reionization #TheOpenJournalOfAstrophysics
#Cosmology #Reionization #CMB
"Reionization after JWST: a photon budget crisis?"
đhttps://arxiv.org/abs/2404.07250
"Our current galaxy observations, taken at face value, imply an excess of ionizing photons and thus a process of reionization in tension with the cosmic microwave background and Lyman-α forest."
Another component of the evolution after the Big Bang that is at tension with the Big Bang.
#astronomy #quasar #SMBH #reionization #CosmicDawn
An article published in the journal "The Astrophysical Journal Letters" reports the discovery of the most distant pair of merging quasars known. A team of researchers combined observations from the Subaru Telescope with the Gemini North Telescope to find traces of this pair of quasars that we see as they were about 900 million years after the Big Bang.
Read the details at https://english.tachyonbeam.com/2024/06/20/first-pair-of-merging-quasars-observed-at-cosmic-dawn/
in the #arXiv
The First Billion Years, According to JWST
1.5 years into the JWST science mission, a snapshot of the great progress made towards understanding the initial chapters of our cosmic history.
by Angela Adamo and co-authors
https://arxiv.org/abs/2405.21054
#JWST #EarlyUniverse #Cosmology #galaxies #AGN #reionization #Universe #DarkMatter #astronomy #astrophysics #astrodon #science #STEM
What sources caused the #reionization of the #universe? New results have effectively demonstrated that small #dwarfgalaxies are the likely producers of prodigious amounts of energetic radiation.
#JWST finds âsmoking gunâ evidence of early galaxies transforming the #universe
Distant #quasar sheds light on the #reionization of the #cosmos
#astronomy #cosmology #reionization #galaxies #JWST
Three articles published in "The Astrophysical Journal" report various aspects of a study on the epoch of reionization and bring evidence that the first galaxies transformed the universe from an opaque place to the current place where light can spread. Researchers used the James Webb Space Telescope together with some ground-based telescopes to observe primordial galaxies.
#astronomy #cosmology #stars #galaxies #reionization #JWST
An article published in the journal "Astronomy & Astrophysics" reports the identification of a group of primordial galaxies that could be among the ones that contributed to the reionization of the universe, making it go from dark to bright. A team of researchers used observations conducted with the James Webb space telescope within the GLASS-JWST program to study 29 very distant and therefore ancient galaxies.
A new supercomputer simulation animates the evolution of the universe
The detailed simulation shows the cosmos changing from a dark, featureless gas to a web of stars and galaxies radiating light.
#cosmology #CreationMyths #UniverseWasAColdDarkPlace #ThenThereWasLight #reionization #spinoza
https://www.sciencenews.org/article/universe-evolution-supercomputer-animation-stars-galaxies
#astronomy #galaxies #stars #reionization An article published in the journal "Monthly Notices of the Royal Astronomical Society" shows evidence that the oldest galaxies in the universe were brighter than expected. https://english.tachyonbeam.com/2019/05/12/the-unexpected-brightness-of-the-earliest-galaxies-in-the-universe-offers-clues-to-a-crucial-moment-in-its-evolution
