A new view of observed galaxies through 3D modelling and visualisation

Dykes, Tim; Gheller, C.; Koribalski, B. S.; Dolag, K.; Krokos, Mel

doi:10.1016/j.ascom.2021.100448

Cited by 1 publication

(1 citation statement)

References 51 publications

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“…The mass of M 83 has been studied by different groups. Recently, the velocity of the flat part of the rotation curve (tracing its mass) was updated from v flat ≈ 150 km s −1 (Kamphuis et al 2015) to v flat ≈ 190 km s −1 (Dykes et al 2021). This is compatible with the rotation curve of the Milky Way, indicating that the two systems have similar masses and should therefore follow the same scaling relations when it comes to the number of expected dwarf galaxy satellites (Javanmardi et al 2019).…”

Section: Introductionmentioning

confidence: 67%

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

Müller,

Pawlowski,

Revaz

et al. 2024

A&A

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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 3sigma and 5sigma 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.

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Section: Introductionmentioning

confidence: 67%