Marcel S. Pawlowski
@8minutesold.bsky.social
Astrophysicist studying cosmic choreographies of dwarf galaxies. Junior Research Group Leader at AIP, Street Photographer (he/him)
Autor des Buchs „Von tanzenden Galaxien, Dunkler Materie, und anderen kosmischen Rätseln“
Potsdam, Germany
Autor des Buchs „Von tanzenden Galaxien, Dunkler Materie, und anderen kosmischen Rätseln“
Potsdam, Germany
There were a few good ones over the years, but I agree, many just make you cringe.
November 2, 2025 at 3:21 PM
There were a few good ones over the years, but I agree, many just make you cringe.
Seems to only apply to the computer science category for now.
November 2, 2025 at 2:28 PM
Seems to only apply to the computer science category for now.
Reposted by Marcel S. Pawlowski
This excellent press release about a paper favouring dark matter over MOND came out a few days ago. A great primer to get you excited for dark matter day and the power of tiny galaxies 🔭🧪 bsky.app/profile/8min...
New press release about our new paper led by my PhD student Mariana Pouseiro Júlio! 🔭🧪☄️
English version here: www.aip.de/en/news/dark...
English version here: www.aip.de/en/news/dark...
October 30, 2025 at 7:38 AM
This excellent press release about a paper favouring dark matter over MOND came out a few days ago. A great primer to get you excited for dark matter day and the power of tiny galaxies 🔭🧪 bsky.app/profile/8min...
Analyzing the dynamics of dwarf galaxies, she finds they deviate from the Radial Acceleration Relation that was established by more massive galaxies. She also shows that simulated dwarfs in a dark matter framework behave as the observed ones, while MOND expectations disagree
arxiv.org/abs/2510.06905
arxiv.org/abs/2510.06905
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...
arxiv.org
October 27, 2025 at 10:45 AM
Analyzing the dynamics of dwarf galaxies, she finds they deviate from the Radial Acceleration Relation that was established by more massive galaxies. She also shows that simulated dwarfs in a dark matter framework behave as the observed ones, while MOND expectations disagree
arxiv.org/abs/2510.06905
arxiv.org/abs/2510.06905
I’m still using the 13 mini, too. I find it’s the perfect size, won’t switch until absolutely necessary.
October 21, 2025 at 8:20 PM
I’m still using the 13 mini, too. I find it’s the perfect size, won’t switch until absolutely necessary.
While the trip was pretty long, I was surprised to have made it all the way to Andromeda.
October 16, 2025 at 12:40 PM
While the trip was pretty long, I was surprised to have made it all the way to Andromeda.
Thanks! You should tell Mariana if you see her. 😉
October 9, 2025 at 11:43 AM
Thanks! You should tell Mariana if you see her. 😉
Our results indicate that the extrapolated RAR does not seem to apply to low-mass dwarf galaxies. That's problematic for MOND, also because our target galaxies are not strongly affected by tides. So it looks like the smallest dwarf galaxies seem require to contain invisible dark matter. 7/7
October 9, 2025 at 8:55 AM
Our results indicate that the extrapolated RAR does not seem to apply to low-mass dwarf galaxies. That's problematic for MOND, also because our target galaxies are not strongly affected by tides. So it looks like the smallest dwarf galaxies seem require to contain invisible dark matter. 7/7
Intriguingly, the simulated dwarfs align nicely with the observed dwarf galaxies, lying systematically above the extrapolated RAR. Their scatter is smaller, but if we mock-observe the simulations and add realistic errors, the scatter becomes comparable at the low-acceleration end. 6/7
October 9, 2025 at 8:55 AM
Intriguingly, the simulated dwarfs align nicely with the observed dwarf galaxies, lying systematically above the extrapolated RAR. Their scatter is smaller, but if we mock-observe the simulations and add realistic errors, the scatter becomes comparable at the low-acceleration end. 6/7
We also investigate several isolated dwarf galaxies of similar stellar mass in the high-resolution EDGE simulations in a ΛCDM cosmology. Since we have perfect knowledge of the mass distributions in the simulations, we can use them to confirm that our approach reliably infers their RAR. 5/7
October 9, 2025 at 8:55 AM
We also investigate several isolated dwarf galaxies of similar stellar mass in the high-resolution EDGE simulations in a ΛCDM cosmology. Since we have perfect knowledge of the mass distributions in the simulations, we can use them to confirm that our approach reliably infers their RAR. 5/7
Turns out that the dwarf indeed deviate, almost all lying systematically above the extrapolated RAR (black solid line). Note that MOND's external field effect would make them lie below the RAR, and that Carina and Draco (similar distances, orbits, baryonic masses) show very different behaviour. 4/7
October 9, 2025 at 8:55 AM
Turns out that the dwarf indeed deviate, almost all lying systematically above the extrapolated RAR (black solid line). Note that MOND's external field effect would make them lie below the RAR, and that Carina and Draco (similar distances, orbits, baryonic masses) show very different behaviour. 4/7