Abstract
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 −25m to −11m. The local luminosity density within 8 Mpc is 6.8 × 108 L ⊙ 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 × 1010 to 2 × 1013 L ⊙, the dependence log(M/L K) ∝ (0.27 ± 0.03) log L K with a dispersion of ∼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〉 ≃ (20–25) M ⊙/L ⊙, was found to be much smaller than the expected global ratio, (80–90)M ⊙/L ⊙, in the standard model with Ωm = 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.
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 31, No. 5, 2005, pp. 332–341.
Original Russian Text Copyright © 2005 by Karachentsev, Kutkin.
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Karachentsev, I.D., Kutkin, A.M. Infrared luminosities of local-volume galaxies. Astron. Lett. 31, 299–307 (2005). https://doi.org/10.1134/1.1922528
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DOI: https://doi.org/10.1134/1.1922528