The Ursa Major Association of Galaxies. VI: A relative dearth of gas-rich dwarf galaxies

Abstract

We determined the HI mass function of galaxies in the Ursa Major association of galaxies using a blind VLA-D array survey, consisting of 54 pointings in a cross pattern, covering the centre as well as the outskirts of the Ursa Major volume. The calculated HI mass function has best-fitting Schechter parameters θ^* = 0.19+/-0.11 Mpc^{-3}, log(M^*_{HI}/M_{\odot}) = 9.8+/-0.8 and α = -0.92+/-0.16. The high-mass end is determined by a complementary, targeted WSRT survey, the low-mass end is determined by the blind VLA survey. The slope is significantly shallower than the slopes of the HIPASS (α = -1.37+/-0.03+/-0.05) and ALFALFA (α = -1.33+/-0.02) HI mass functions, which are measured over much larger volumes and cover a wider range of cosmic environments: There is a relative lack of low HI mass galaxies in the Ursa Major region. This difference in the slope strongly hints at an environmental dependence of the HI mass function slope.

19 pages, 15 figures. Accepted for publication in MNRAS

References in corpus (6)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Cold gas accretion in galaxies
• Galaxy Groups: A 2MASS Catalog
• The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies
• Galaxy Groups
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• MIGHTEE-HI: Discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT
• The FAST Ursa Major supergroup HI survey (FUMaS): catalog and HI mass function
• The MeerKAT Fornax Survey VI. The collapse of the galaxy HI Mass Function in Fornax
• The MeerKAT Fornax Survey -- I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster