Galaxy Groups within 3500 km s${}^{-1}$

Abstract

A study of the group properties of galaxies in our immediate neighborhood provides a singular opportunity to observationally constrain the halo mass function, a fundamental characterization of galaxy formation. Detailed studies of individual groups have provided the coefficients of scaling relations between a proxy for the virial radius, velocity dispersion, and mass that usefully allows groups to be defined over the range $10^{10}-10^{15}$ $M_{\odot }$. At a second hierarchical level, associations are defined as regions around collapsed halos extending to the zero velocity surface at the decoupling from cosmic expansion. The most remarkable result of the study emerges from the construction of the halo mass function from the sample. At $\sim 10^{12}$ $M_{\odot }$ there is a jog from the expectation Sheth-Tormen function, such that halo counts drop by a factor $\sim 3$ in all lower mass bins.

34 pages, 17 figures and 4 tables. Accepted for publication in The Astrophysical Journal

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• How Many Kilonovae Can Be Found in Past, Present, and Future Survey Datasets?
• WALLABY Early Science - III. An HI Study of the Spiral Galaxy NGC 1566
• Dwarf Galaxies in the Local Volume
• Evidence of a fast bar in the weakly-interacting galaxy NGC 4264 with MUSE
• Cosmic flow around local massive galaxies
• The Assembly of the Virgo Cluster, Traced by its Galaxy Halos