Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. A too-many-dwarf-galaxy-satellites problem in the M 83 group
 
Loading...
Thumbnail Image
research article

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

Muller, Oliver
•
Pawlowski, Marcel S.
•
Revaz, Yves  
Show more
April 8, 2024
Astronomy & Astrophysics

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 Lambda 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 M-V = -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 (> 10(8) solar masses) but underestimate it at the faint end (down to 10(6) solar masses) at more than 3 sigma and 5 sigma levels, respectively. This indicates a too-many-satellites problem for M 83 in the Lambda 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.

  • Files
  • Details
  • Metrics
Loading...
Thumbnail Image
Name

document.pdf

Type

Publisher's Version

Access type

openaccess

License Condition

CC BY

Size

7.2 MB

Format

Adobe PDF

Checksum (MD5)

ef64a9c8194be9e1c408852911ba7f02

Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés