A correlation between the number of satellites and the baryonic bulge-to-total ratio extending beyond the Local Group

Abstract

Recent observations of the fields surrounding a few Milky-Way-like galaxies in the local Universe have become deep enough to enable investigations of the predictions of the standard LCDM cosmological model down to small scales outside the Local Group. Motivated by an observed correlation between the number of dwarf satellites (N_sat) and the bulge-to-total baryonic mass ratios (B/T) of the three main galaxies in the Local Group, i.e. the Milky Way, Andromeda, and Triangulum (M33), we use published data of three well-studied galaxies outside the Local Group, namely M81, Centaurus A, and M101, and their confirmed satellites, and we find a strong and significant correlation between N_sat and B/T. This presents itself in contradiction with the hitherto published results from cosmological simulations reporting an absence of a correlation between N_sat and B/T in the LCDM model. We conclude that, based on the current data, the N_sat vs. B/T correlation is no longer a property confined to only the Local Group.

5 pages, 1 figure, accepted for publication by MNRAS Letters

References in corpus (14)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation
• The spatial distribution of the Milky Way and Andromeda satellite galaxies
• Discovery of New Dwarf Galaxies in the M81 Group
• The discovery of seven extremely low surface brightness galaxies in the field of the nearby spiral galaxy M101
• A thousand shadows of Andromeda: rotating planes of satellites in the Millennium-II cosmological simulation
• Wide-Field Survey of Dwarf Satellite Systems Around 10 Hosts in the Local Volume
• Discovery of a close pair of faint dwarf galaxies in the halo of Centaurus A
• The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group
• Discovery of diffuse dwarf galaxy candidates around M101
• Galaxies grow their bulges and black holes in diverse ways
• Comparing the observable properties of dwarf galaxies on and off the Andromeda plane
• Using Surface Brightness Fluctuations to Study Nearby Satellite Galaxy Systems: the Complete Satellite System of M101
• The dark matter halo density profile, spiral arm morphology and black hole mass of M33

Cited by in corpus (12)

• The KBC void and Hubble tension contradict $\Lambda$CDM on a Gpc scale $-$ Milgromian dynamics as a possible solution
• Census and classification of low-surface-brightness structures in nearby early-type galaxies from the MATLAS survey
• Can cosmological simulations capture the diverse satellite populations of observed Milky Way analogues?
• Tracing satellite planes in the Sculptor group: I. Discovery of three faint dwarf galaxies around NGC 253
• The Satellite Luminosity Function of M101 into the Ultra-Faint Dwarf Galaxy Regime
• The formation of exponential disk galaxies in MOND
• The abundance of dwarf galaxies around low-mass giants in the Local Volume
• Tracing the Local Volume galaxy halo-to-stellar mass ratio with satellite kinematics
• KKH 22, the first dwarf spheroidal satellite of IC 342
• Is the correlation between the bulge-to-total stellar mass ratio and the number of dwarf galaxies in tension with $\Lambda$CDM?
• Implications of the correlation between bulge-to-total baryonic mass ratio and the number of satellites for SAGA galaxies
• On the Evidence for Violation of the Equivalence Principle in Disk Galaxies