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

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arxiv 1705.08068 v1 pith:PBUIWC44 submitted 2017-05-23 astro-ph.GA

Ehsan Kourkchi , R. Brent Tully This is my paper
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keywords massfunctiongroupshalodefinedgalaxyodotvelocity
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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 $\sim10^{12}$ $M_\odot$ 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.

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Cited by 6 Pith papers

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