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Pengfei Li @pengfeili.bsky.social · 03/12/2025

An interesting post for our new paper.

Reposted by Pengfei Li

Stacy McGaugh @dudedarkmatter.bsky.social · 25/11/2025

We infer the initial density profile of the dark matter halo of the Galaxy from the Gaia rotation curve, assessing the adiabatic compression that would be induced by plausible baryonic mass models. The data want a primordial halo with a core & rapid outer fall-off, unlike NFW as expected in LCDM.

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Pengfei Li @pengfeili.bsky.social · 27/11/2025

Please check the great summary of our new paper, inferring the primordial dark matter halos from observations.

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Reposted by Pengfei Li

Marcel S. Pawlowski @8minutesold.bsky.social · 09/10/2025

Paper day! My PhD student Mariana Júlio, with @readdark.bsky.social, @pengfeili.bsky.social and others, studies the internal dynamics of dwarf galaxies and finds they don't agree with the Radial Acceleration Relation, challenging the dark matter alternative MOND. arxiv.org/abs/2510.06905 🔭☄️🧪 1/7

arxiv.org

The radial acceleration relation at the EDGE of galaxy formation: testing its universality in low-mass dwarf galaxies

A tight correlation between the baryonic and observed acceleration of galaxies has been reported over a wide range of mass ($10^8 < M_{\rm bar}/{\rm M}_\odot < 10^{11}$) - the Radial Acceleration Rela...

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Reposted by Pengfei Li

Marcel S. Pawlowski @8minutesold.bsky.social · 14/04/2025

Jamie‘s new Nature Astronomy paper on how M31‘s satellite galaxy system is much more asymmetric than typically expected from cosmological simulations is now out on the arXiv, too. 🔭 arxiv.org/abs/2504.08047

arxiv.org

Andromeda's asymmetric satellite system as a challenge to cold dark matter cosmology

The Andromeda galaxy is surrounded by a strikingly asymmetrical distribution of satellite dwarf galaxies aligned towards the Milky Way. The standard model of cosmology predicts that most satellite gal...

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Pengfei Li @pengfeili.bsky.social · 18/11/2024

#Paperday New paper accepted by A&A on the mass measurements and comparisons for eROSITA clusters is available at arxiv.org/abs/2411.09735. One result that might be particularly useful is the spatially resolved mass-velocity dispersion relation. A thread summarizes the paper.

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Marcel S. Pawlowski @8minutesold.bsky.social · 06/02/2024

Now out: Episode 3 of the dwarf galaxies and cosmology video series produced by AIP PhD students Mariana P. Júlio and Jamie K. Kanehisa. This one interviews Paris Observatory's Yanbin Yang and AIP's Humboldt Fellow @pengfeili.bsky.social on the topic of Dark Matter. www.youtube.com/watch?v=Z6IU...

youtube.com

Dark Matter • IAUS379 | Dr. Pengfei Li & Dr. Yanbin Yang

Dr. Pengfei Li, postdoctoral researcher at the Leibniz Institute for Astrophysics Potsdam (AIP), Germany, and Dr. Yanbin Yang from the Paris Observatory, Fra...

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Reposted by Pengfei Li

Marcel S. Pawlowski @8minutesold.bsky.social · 11/01/2024

Check out Ep2 of the interview series on dwarf galaxies, the Local Group & cosmology, shot at our IAU symposium. 🔭🧪 This one interviews the fantastic Tony Sohn about measuring the motion of galaxies. Produced by AIP PhD students J.K. Kanehisa & M.P. Júlio +@pengfeili.bsky.social youtu.be/vTAbQw78GIE

youtu.be

Measuring the motion of galaxies • IAUS379 | Dr. Tony Sohn

Dr. Tony Sohn from the Space Telescope Science Institute, USA, talks about measuring the motion of galaxies that are millions of light years away and of star...

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Reposted by Pengfei Li

Marcel S. Pawlowski @8minutesold.bsky.social · 13/12/2023

Want to learn about astrophysics from international experts? 🔭🧪 Check out this new series of interviews shot at our IAU Symposium #IAUS379. The first video on "Dwarf Galaxies" featuring the fantastic @runningastronomer.bsky.social is online now (next one in January): www.youtube.com/watch?v=iQJI...

youtube.com

The smallest galaxies in the Universe • IAUS379 | Dr. Michelle Collins

Dr. Michelle Collins, University of Surrey, UK, answers questions on dwarf galaxies, the smallest and most abundant galaxies in the Universe. Discover what t...

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