#dwarfgalaxies — Public Fediverse posts

New in the #VirtualObservatory: “Extremely metal-poor galaxies at z<1 from DESI” by Zou Hu et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/961/173
#DwarfGalaxies #Redshifted #LineIntensities #ChemicalAbundances

New in the #VirtualObservatory: “INT monitoring of Local Grp. VII. IC 10 photometry” by Gholami M. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/170/54
#LocalGroup #VariableStars #DwarfGalaxies #Photometry

Weekly Update from the Open Journal of Astrophysics – 16/05/2026

It’s Saturday once again, so time for 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 104 and the total so far published by OJAp up to 552. It took us until late July to pass 100 last year.

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, published on Monday 11th May in the folder High-Energy Astrophysical Phenomena is “Triaxial magnetars as sources of fast radio bursts” by Jonathan I Katz (Washington University, USA). This paper suggests that the mysterious properties of Fast Radio Bursts (FRB) could be explained by triaxial magnetars, with their activity levels influenced by precessional time scales.

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/116554775791392800

The second paper for this week, published on Tuesday 12th May in the folder Astrophysics of Galaxies, is “The Abundance of Thin Dwarf Galaxies: a Challenge for Cosmological Simulations” by Jose Benavides & Laura V. Sales (UC Riverside, USA), Julio F. Navarro (U. Victoria, Canada), Simon D. M. White (MPA Garching, Germany), and Carlos S. Frenk, Kyle A. Oman & Shaun Cole (U. Durham, UK). Depending on mass up to 40% of galaxies are intrinsically flat, a fraction that numerical models of galaxy formation struggle to reproduce suggesting the models are incomplete.

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/116560106342500157

Next one up, the third paper of the week, also published on Tuesday 12th May but in the folder Cosmology and Nongalactic Astrophysics is “Cosmological peculiar velocities in general relativity” by Chris Clarkson (Queen Mary, University of London, UK) and Roy Maartens (U. Western Cape, South Africa). This paper refutes claims that the 1+3 covariant approach to cosmological perturbation theory predicts stronger growth of galaxy peculiar velocities, arguing that standard treatments are correct and fully relativistic.

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/116560224426499932

The fourth paper this week, published on Wednesday May 13th “Possible evidence for a pair-instability supernova nature of ultra-early JWST sources” by Andrea Ferrara & Stefano Carniani (Scuola Normale Superiore, Pisa, Italy), Takahiro Morishita (California Institute of Technology, USA), and Massimo Stiavelli (Space Telescope Science Institute, USA). Published in the section Astrophysics of Galaxies. This paper argues that recent observations challenge early galaxy formation models, suggesting that the bright source, Capotauro, could be a supernova from a massive, metal-free star, not a luminous galaxy as initially thought.

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/116566147448743997

The fifth and final article of this week was also published on Wednesday 13th May but in the folder Cosmology and Nongalactic Astrophysics. The title is “Evolving and interacting dark energy: photometric and spectroscopic synergy with DES Y3 and DESI DR2” and it is by Maria Tsedrik and Benjamin Bose (University of Edinburgh, UK). The study investigates the Dark Scattering interacting dark energy scenario, using data from various sources. Results show no evidence of dark-sector interaction and a preference for the Chevallier-Polarski-Linder parametrisation.

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/116566165139100860

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

Weekly Update from the Open Journal of Astrophysics – 16/05/2026

It’s Saturday once again, so time for 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 104 and the total so far published by OJAp up to 552. It took us until late July to pass 100 last year.

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, published on Monday 11th May in the folder High-Energy Astrophysical Phenomena is “Triaxial magnetars as sources of fast radio bursts” by Jonathan I Katz (Washington University, USA). This paper suggests that the mysterious properties of Fast Radio Bursts (FRB) could be explained by triaxial magnetars, with their activity levels influenced by precessional time scales.

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/116554775791392800

The second paper for this week, published on Tuesday 12th May in the folder Astrophysics of Galaxies, is “The Abundance of Thin Dwarf Galaxies: a Challenge for Cosmological Simulations” by Jose Benavides & Laura V. Sales (UC Riverside, USA), Julio F. Navarro (U. Victoria, Canada), Simon D. M. White (MPA Garching, Germany), and Carlos S. Frenk, Kyle A. Oman & Shaun Cole (U. Durham, UK). Depending on mass up to 40% of galaxies are intrinsically flat, a fraction that numerical models of galaxy formation struggle to reproduce suggesting the models are incomplete.

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/116560106342500157

Next one up, the third paper of the week, also published on Tuesday 12th May but in the folder Cosmology and Nongalactic Astrophysics is “Cosmological peculiar velocities in general relativity” by Chris Clarkson (Queen Mary, University of London, UK) and Roy Maartens (U. Western Cape, South Africa). This paper refutes claims that the 1+3 covariant approach to cosmological perturbation theory predicts stronger growth of galaxy peculiar velocities, arguing that standard treatments are correct and fully relativistic.

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/116560224426499932

The fourth paper this week, published on Wednesday May 13th “Possible evidence for a pair-instability supernova nature of ultra-early JWST sources” by Andrea Ferrara & Stefano Carniani (Scuola Normale Superiore, Pisa, Italy), Takahiro Morishita (California Institute of Technology, USA), and Massimo Stiavelli (Space Telescope Science Institute, USA). Published in the section Astrophysics of Galaxies. This paper argues that recent observations challenge early galaxy formation models, suggesting that the bright source, Capotauro, could be a supernova from a massive, metal-free star, not a luminous galaxy as initially thought.

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/116566147448743997

The fifth and final article of this week was also published on Wednesday 13th May but in the folder Cosmology and Nongalactic Astrophysics. The title is “Evolving and interacting dark energy: photometric and spectroscopic synergy with DES Y3 and DESI DR2” and it is by Maria Tsedrik and Benjamin Bose (University of Edinburgh, UK). The study investigates the Dark Scattering interacting dark energy scenario, using data from various sources. Results show no evidence of dark-sector interaction and a preference for the Chevallier-Polarski-Linder parametrisation.

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/116566165139100860

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

LYRA ultra-faints - the emergence of faint dwarf galaxies in the presence of an early Lyman–Werner background: https://academic.oup.com/mnras/article/548/2/stag439/8661239?login=false -> Local #DwarfGalaxies may preserve a record of the infant Universe: https://www.su.se/english/news/articles/2026-04-24-local-dwarf-galaxies-may-preserve-a-record-of-the-infant-universe

LYRA ultra-faints - the emergence of faint dwarf galaxies in the presence of an early Lyman–Werner background: https://academic.oup.com/mnras/article/548/2/stag439/8661239?login=false -> Local #DwarfGalaxies may preserve a record of the infant Universe: https://www.su.se/english/news/articles/2026-04-24-local-dwarf-galaxies-may-preserve-a-record-of-the-infant-universe

James Webb Space Telescope Spots Huge Black Holes Where They Shouldn’t Be, Adding to the Mystery of “Little Red Dots”

James Webb Space Telescope (JWST) observations have revealed unexpectedly overmassive black holes at the hearts of a pair…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Space #activegalacticnucleus #dwarfgalaxies #JamesWebbSpaceTelescope #LittleRedDots #Science #supermassiveblackhole
https://www.newsbeep.com/us/563152/

New in the #VirtualObservatory: “Metallicities for emission line galaxies from HALO7D” by Pharo J. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/959/48
#DwarfGalaxies #VisibleAstronomy #Spectroscopy #ChemicalAbundances

New in the #VirtualObservatory: “Metallicity measurements of ~500 stars across 13 UFDs” by Fu S.W. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/958/167
#DwarfGalaxies #Metallicity #HstPhotometry #VisibleAstronomy

New in the #VirtualObservatory: “Abundances of low-metallicity stars in Sgr dwarf galaxy” by Ou X. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/169/279
#Photometry #RadialVelocity #VisibleAstronomy #DwarfGalaxies

The Extended Stellar Distribution in the Outskirts of the Ursa Minor Dwarf Spheroidal Galaxy: https://iopscience.iop.org/article/10.3847/2041-8213/ae0cb3 -> Do Even Low-mass #DwarfGalaxies Merge? New Clues from the Outer Stars of a Milky Way Satellite: https://subarutelescope.org/en/results/2026/01/13/3641.html

The Extended Stellar Distribution in the Outskirts of the Ursa Minor Dwarf Spheroidal Galaxy: https://iopscience.iop.org/article/10.3847/2041-8213/ae0cb3 -> Do Even Low-mass #DwarfGalaxies Merge? New Clues from the Outer Stars of a Milky Way Satellite: https://subarutelescope.org/en/results/2026/01/13/3641.html

New in the #VirtualObservatory: “Abundances of member stars of the Sextans dSph” by Roederer I.U. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/954/55
#VisibleAstronomy #DwarfGalaxies #InterstellarReddening #LineIntensities

New in the #VirtualObservatory: “GCs of dwarf galaxies in Perseus cluster” by Saifollahi T. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/703/A184
#GlobularStarClusters #GalaxyClusters #DwarfGalaxies #InfraredAstronomy

JWST/NIRCam View of the Resolved Stellar Populations of the Interacting #DwarfGalaxies NGC 4485 and NGC 4490: https://iopscience.iop.org/article/10.3847/1538-4357/adfccc -> A dance of dwarf galaxies: https://esawebb.org/images/potm2511a/

JWST/NIRCam View of the Resolved Stellar Populations of the Interacting #DwarfGalaxies NGC 4485 and NGC 4490: https://iopscience.iop.org/article/10.3847/1538-4357/adfccc -> A dance of dwarf galaxies: https://esawebb.org/images/potm2511a/

New in the #VirtualObservatory: “WISDOM Proj XII ALMA CO(2-1) of clumps and clouds” by Liu L. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/517/632
#Astrometry #DwarfGalaxies #Interferometry #Spectroscopy

#DwarfGalaxies May Hold the Answers to the Debate on #DarkMatter

https://www.universetoday.com/articles/dwarf-galaxies-may-hold-the-answers-to-the-debate-on-dark-matter

#DwarfGalaxies May Hold the Answers to the Debate on #DarkMatter

https://www.universetoday.com/articles/dwarf-galaxies-may-hold-the-answers-to-the-debate-on-dark-matter

New in the #VirtualObservatory: “Optical variability of ~700 low mass AGNs” by Burke C.J. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/2736
#Redshifted #DwarfGalaxies #ActiveGalacticNuclei #Astrometry

New in the #VirtualObservatory: “U-SMAC II. FUV catalog of sources detected in SMC” by Hota S. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/255
#Surveys #MagellanicClouds #DwarfGalaxies #Photometry

New in the #VirtualObservatory: “Fornax dSph star members study with GaiaEDR3” by Yang Y. et al.
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/512/4171
#DwarfGalaxies #VisibleAstronomy #Galaxies #LocalGroup

Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE) - The Search for Satellites around Low-mass Hosts: https://iopscience.iop.org/article/10.3847/1538-4357/ade9a4 -> New Dartmouth Survey Maps Satellite Systems of #DwarfGalaxies: https://fas.dartmouth.edu/news/2025/07/new-dartmouth-survey-maps-satellite-systems-dwarf-galaxies - the discovery of hundreds of potential dwarf galaxies could shed light on the early universe's formation.

Identifying Dwarfs of MC Analog GalaxiEs (ID-MAGE) - The Search for Satellites around Low-mass Hosts: https://iopscience.iop.org/article/10.3847/1538-4357/ade9a4 -> New Dartmouth Survey Maps Satellite Systems of #DwarfGalaxies: https://fas.dartmouth.edu/news/2025/07/new-dartmouth-survey-maps-satellite-systems-dwarf-galaxies - the discovery of hundreds of potential dwarf galaxies could shed light on the early universe's formation.

#DwarfGalaxies Like the #Magellanic Clouds Have Their Own Small #Satellite #Galaxies

https://www.universetoday.com/articles/dwarf-galaxies-like-the-magellanic-clouds-have-their-own-small-satellite-galaxies

#DwarfGalaxies Like the #Magellanic Clouds Have Their Own Small #Satellite #Galaxies

https://www.universetoday.com/articles/dwarf-galaxies-like-the-magellanic-clouds-have-their-own-small-satellite-galaxies

When #Stars Collide:
#Hubble Captures #Cosmic Cannibalism in #DwarfGalaxies

https://scitechdaily.com/when-stars-collide-hubble-captures-cosmic-cannibalism-in-dwarf-galaxies/

When #Stars Collide:
#Hubble Captures #Cosmic Cannibalism in #DwarfGalaxies

https://scitechdaily.com/when-stars-collide-hubble-captures-cosmic-cannibalism-in-dwarf-galaxies/

⭐ 💥 ⭐ Merging star clusters: For the first time, researchers have observed the fusion of star clusters in dwarf galaxies — a discovery made by chance through observations from the #Hubble space telescope.

Read more in our news article or check out the original study in #Nature:

🆕 https://www.uibk.ac.at/en/newsroom/2025/celestial-spectacle-witnessed/

📖 https://www.nature.com/articles/s41586-025-08783-9

#astrodon #physics #astrophysics #astronomy #galaxy #dwarfGalaxies

⭐ 💥 ⭐ Merging star clusters: For the first time, researchers have observed the fusion of star clusters in dwarf galaxies — a discovery made by chance through observations from the #Hubble space telescope.

Read more in our news article or check out the original study in #Nature:

🆕 https://www.uibk.ac.at/en/newsroom/2025/celestial-spectacle-witnessed/

📖 https://www.nature.com/articles/s41586-025-08783-9

#astrodon #physics #astrophysics #astronomy #galaxy #dwarfGalaxies

Evidence of star cluster migration and merger in dwarf galaxies: https://www.nature.com/articles/s41586-025-08783-9 -> Hubble Space telescope unveils the first images of ongoing star cluster mergers near the center of #DwarfGalaxies: https://www.oulu.fi/en/news/hubble-space-telescope-unveils-first-images-ongoing-star-cluster-mergers-near-center-dwarf-galaxies

Evidence of star cluster migration and merger in dwarf galaxies: https://www.nature.com/articles/s41586-025-08783-9 -> Hubble Space telescope unveils the first images of ongoing star cluster mergers near the center of #DwarfGalaxies: https://www.oulu.fi/en/news/hubble-space-telescope-unveils-first-images-ongoing-star-cluster-mergers-near-center-dwarf-galaxies

Astronomers have apparently discovered a new galactic wallflower, the "lamest" dwarf satellite of the Andromeda Galaxy. 🎉🔭 Meanwhile, IOPscience is more excited about cookies than cosmic phenomena, because who doesn't love reading about space with a side of privacy policy? 🍪😂
https://iopscience.iop.org/article/10.3847/2041-8213/adb433 #astronomy #AndromedaGalaxy #dwarfgalaxies #spacecookies #cosmicnews #HackerNews #ngated

Astronomers have apparently discovered a new galactic wallflower, the "lamest" dwarf satellite of the Andromeda Galaxy. 🎉🔭 Meanwhile, IOPscience is more excited about cookies than cosmic phenomena, because who doesn't love reading about space with a side of privacy policy? 🍪😂
https://iopscience.iop.org/article/10.3847/2041-8213/adb433 #astronomy #AndromedaGalaxy #dwarfgalaxies #spacecookies #cosmicnews #HackerNews #ngated

Indian-origin scientist Dr. Ragadeepika Pucha at the University of Utah, has made a groundbreaking discovery in the study of black holes. Using data from the Dark KNOW MORE...https://blogzine2025.blogspot.com/2025/03/laser-focused-la-salle-green-spikers.html?m=1
#BlackHole #SpaceScience BlackHoleDiscovery #Astrophysics
#GalaxyEvolution #Galaxy #DwarfGalaxies #TEDTalks #TEDxGateway #IndianScientist

Survey of Andromeda's Satellite Galaxies ✨

#DwarfGalaxies #Galaxies #MilkyWay #NearbyGalaxies

▶️ 1 new picture from Hubble (NASA) https://commons.wikimedia.org/wiki/File:Survey_of_Andromeda%27s_Satellite_Galaxies_%282025-009%29.png

Survey of Andromeda's Satellite Galaxies ✨

#DwarfGalaxies #Galaxies #MilkyWay #NearbyGalaxies

▶️ 1 new picture from Hubble (NASA) https://commons.wikimedia.org/wiki/File:Survey_of_Andromeda%27s_Satellite_Galaxies_%282025-009%29.png

#astronomy #galaxies #DwarfGalaxies #BlackHoles

An article to be published in "The Astrophysical Journal" reports the discovery of about 2,500 new candidate active galactic nuclei in dwarf galaxies and about 300 new candidate intermediate-mass black holes. A team of researchers examined observations conducted with the Dark Energy Spectroscopic Instrument (DESI) on the Nicholas U. Mayall 4-meter Telescope in Arizona to find all these possible black holes.

https://english.tachyonbeam.com/2025/02/21/2500-new-candidate-active-galactic-nuclei-in-dwarf-galaxies-and-about-300-new-candidate-intermediate-mass-black-holes-discovered/

#astronomy #galaxies #DwarfGalaxies #BlackHoles

An article to be published in "The Astrophysical Journal" reports the discovery of about 2,500 new candidate active galactic nuclei in dwarf galaxies and about 300 new candidate intermediate-mass black holes. A team of researchers examined observations conducted with the Dark Energy Spectroscopic Instrument (DESI) on the Nicholas U. Mayall 4-meter Telescope in Arizona to find all these possible black holes.

https://english.tachyonbeam.com/2025/02/21/2500-new-candidate-active-galactic-nuclei-in-dwarf-galaxies-and-about-300-new-candidate-intermediate-mass-black-holes-discovered/

in the #arXiv

Discovery of a Rare Group of Dwarf Galaxies in the Local Universe

by Sanjaya Paudel and co-authors
https://arxiv.org/abs/2411.10045

#Cosmology #galaxies #dwarfgalaxies #universe #astronomy #astrophysics #astrodon #news #science #STEM #physics

in the #arXiv

Discovery of a Rare Group of Dwarf Galaxies in the Local Universe

by Sanjaya Paudel and co-authors
https://arxiv.org/abs/2411.10045

#Cosmology #galaxies #dwarfgalaxies #universe #astronomy #astrophysics #astrodon #news #science #STEM #physics

Tripling the Census of Dwarf AGN Candidates Using #DESI Early Data: https://arxiv.org/abs/2411.00091 -> A cosmic census triples the known number of #BlackHoles in #DwarfGalaxies: https://www.sciencenews.org/article/census-black-holes-dwarf-galaxies - the new tally takes a step toward revealing how black holes and galaxies grow together.

Tripling the Census of Dwarf AGN Candidates Using #DESI Early Data: https://arxiv.org/abs/2411.00091 -> A cosmic census triples the known number of #BlackHoles in #DwarfGalaxies: https://www.sciencenews.org/article/census-black-holes-dwarf-galaxies - the new tally takes a step toward revealing how black holes and galaxies grow together.

#astronomy #JWST #DwarfGalaxies #SMBH #LID568

An article published in the journal "Nature Astronomy" reports the results of the study of the dwarf galaxy cataloged as LID-568, which has at its center a supermassive black hole that is devouring materials at a rate that is more than 40 times faster than its theoretical limits.

https://english.tachyonbeam.com/2024/11/07/the-supermassive-black-hole-at-the-center-of-the-galaxy-lid-568-is-devouring-material-beyond-its-theoretical-limits/

#astronomy #JWST #DwarfGalaxies #SMBH #LID568

An article published in the journal "Nature Astronomy" reports the results of the study of the dwarf galaxy cataloged as LID-568, which has at its center a supermassive black hole that is devouring materials at a rate that is more than 40 times faster than its theoretical limits.

https://english.tachyonbeam.com/2024/11/07/the-supermassive-black-hole-at-the-center-of-the-galaxy-lid-568-is-devouring-material-beyond-its-theoretical-limits/

"Now, we are faced with a 'too many satellites problem,' rather than a 'missing satellites problem.'"

Discovery of two new dwarf galaxies, Virgo III and Sextans II, orbiting the Milky Way.
https://www.tohoku.ac.jp/en/press/too_many_missing_satellite_galaxies_found.html

#Cosmology #MilkyWay #galaxy #galaxies #dwarfgalaxies #Virgo3 #Sextans2 #astronomy #astrophysics #astrodon #physics #science

The Milky Way’s Smallest, Faintest Satellite Galaxy Found https://www.universetoday.com/166388/the-milky-ways-smallest-faintest-satellite-galaxy-found/ #satellitegalaxies #globularclusters #darkmatterhalo #dwarfgalaxies #darkmatter #astronomy #lambdacdm #galaxies #milkyway

#DwarfGalaxies Could be the Key to Explaining #DarkMatter

https://www.universetoday.com/166291/dwarf-galaxies-could-be-the-key-to-explaining-dark-matter/

An evolutionary continuum from nucleated #DwarfGalaxies to star clusters: https://arxiv.org/abs/2311.05448 -> Gemini North Reveals the Formation of Dense Dwarf Galaxy ‘Fossils’: https://noirlab.edu/public/news/noirlab2330/ - dwarf galaxies stripped of their stars prove to be the missing link in the formation of rare ultra-compact dwarf galaxies.

Dwarf Irregular Galaxy UGC 8091 ✨🪐

#DwarfGalaxies #IrregularGalaxies #NearbyGalaxies #PlanetaryAtmospheres/Weather #Planets #Saturn #SolarSystem

⏩ 3 new pictures from Hubble (NASA) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=7&user=OptimusPrimeBot&ilshowall=1&offset=20231226093148