A too-many-dwarf-galaxy-satellites problem in the M 83 group - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2024

A too-many-dwarf-galaxy-satellites problem in the M 83 group

Marcel S. Pawlowski
  • Function : Author
Yves Revaz
  • Function : Author
Aku Venhola
  • Function : Author
Marina Rejkuba
  • Function : Author
Michael Hilker
  • Function : Author

Abstract

Dwarf galaxies in groups of galaxies provide excellent test cases for models of structure formation. This led to a so-called small-scale crisis, including the famous missing-satellites and too-big-to-fail problems. It was suggested that these two problems can be resolved by introducing baryonic physics to cosmological simulations. We tested the nearby grand spiral M 83 - a Milky Way sibling - to determine whether its number of dwarf galaxy companions is compatible with today's Λ cold dark matter model using two methods: with cosmological simulations that include baryons and with theoretical predictions from the subhalo mass function. By employing distance measurements, we recovered a list of confirmed dwarf galaxies within 330 kpc of M 83 down to a magnitude of MV = −10. We find that both the state-of-the-art hydrodynamical cosmological simulation Illustris-TNG50 and theoretical predictions agree with the number of confirmed satellites around M 83 at the bright end of the luminosity function (> 108 solar masses) but underestimate it at the faint end (down to 106 solar masses) at more than 3σ and 5σ levels, respectively. This indicates a too-many-satellites problem for M 83 in the Λ cold dark matter model. The actual degree of tension with cosmological models is underestimated because the number of observed satellites is incomplete due to the high contamination of spurious stars and Galactic cirrus.
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insu-04566624 , version 1 (06-05-2024)

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Oliver Müller, Marcel S. Pawlowski, Yves Revaz, Aku Venhola, Marina Rejkuba, et al.. A too-many-dwarf-galaxy-satellites problem in the M 83 group. Astronomy and Astrophysics - A&A, 2024, 684, ⟨10.1051/0004-6361/202348969⟩. ⟨insu-04566624⟩
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