Galaxy luminosity functions, M/L ratios, and closure of the Universe - Numbers and problems

Details Galaxy luminosity functions, M/L ratios, and closure of the Universe - Numbers and problems Galaxy luminosity functions, M/L ratios, and closure of the Universe - Numbers and problems

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985comap..11...53f&link_type=abstract

Comments on Modern Physics, Part C - Comments on Astrophysics (ISSN 0146-2970), vol. 11, Sept. 1985, p. 53-67.

Astronomy and Astrophysics

Astrophysics

77

Astronomical Models, Galaxies, Luminosity, Mass To Light Ratios, Universe, Error Analysis, Galactic Structure, Hubble Constant

Scientific paper

Data on the luminosity function (LF) of galaxies are reviewed and compared, and the result of Kirshner et al. (1983) is chosen as a best guess. Departures form this "standard LF" for specific galaxy types and environments (clusters, groups, field) are discussed briefly. This LF leads to a density of about 1.4×10-2h "galaxies" Mpc-3. The mean M/L ratio needed to give critical cosmological density (Ω0 = 1) is then 920 h in solar units on the BT0 (face-on) magnitude system. Comparison with measured M/L ratios for galaxies and clusters, and with constraints imposed by inflation and nucleosynthesis, poses two problems of "invisible mass".

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