Infrared luminosities of local-volume galaxies

Based on data from the Two-Micrometer All-Sky Survey (2MASS), we analyzed the infrared properties of 451 Local-Volume galaxies at distances D <= 10 Mpc. We determined the K-band luminosity function of the galaxies in the range of absolute magnitudes from -25(m) to -11(m). The local luminosity density within 8 Mpc is 6.8 x 10(8) L-circle dot MpC(-3), a factor of 1.5 +/- 0.1 higher than the global mean K-band luminosity density. We determined the ratios of the virial mass to the K-band luminosity for nearby groups and clusters of galaxies. In the luminosity range from 5 x 10(10) to 2 x 10(13)L(circle dot), the dependence log(M/L-K) proportional to (0.27 +/- 0.03) log L-K with a dispersion of similar to 0.1 comparable to the measurement errors of the masses and luminosities of the systems of galaxies holds for the groups and clusters of galaxies. The ensemble-averaged ratio, < M/L-K > similar or equal to (20-25)M-circle dot/L-circle dot,was found to be much smaller than the expected global ratio, (80-90)M-circle dot/L-circle dot, in the standard model with Omega(m) = 0.27. This discrepancy can be eliminated if the bulk of the dark matter in the Universe is not associated with galaxies and their systems. (c) 2005 Pleiades Publishing, Inc.