Infrared luminosities of galaxies in the Local Volume
Abstract
Near-infrared properties of 451 galaxies with distances D ≤ 10 Mpc are considered basing on the all-sky two micron survey (2MASS). A luminosity function of the galaxies in the K-band is derived within [-25,-11] mag. The local (D < 8 Mpc) luminosity density is estimated to be 6.8*108 Lsun/Mpc3 that exceeds (1.5+-0.1) times the global cosmic density in the K-band. Virial mass-to-K-luminosity ratios are determined for nearby groups and clusters. In the luminosity range of (5*1010 - 2*1013)Lsun, the groups and clusters follow the relation (M/LK) propto (0.27+-0.03) lg(LK) with a scatter of \~0.1 comparable to errors of the observables. The mean ratio <M/LK> ~= (20-25) Msun/Lsun for the galaxy systems turns out to be significantly lower than the global ratio, (80-90)Msun/Lsun, expected in the standard cosmological model with the matter density of Omegam =0.27. This discrepancy can be resolved if most of dark matter in the universe is not associated with galaxies and their systems.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.