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Date and Time of the Query: 2019-05-22 T17:41:36 PDT
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For refcode 1993ApJ...419..469G:
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1993ApJ...419..469G COLORS, LUMINOSITIES, AND MASSES OF DISK GALAXIES GIUSEPPE GAVAZZI Osservatorio Astronomico di Brera, via Brera, 28,20121, Milano, Italy Received 1992 November 30; accepted 1993 June 28 ABSTRACT We explore the known dependence of the slope of the Tully-Fisher (TF) relation on observational wavelength using a large multifrequency galaxy data-base. We confirm that (1) in the infrared the slope of the TF relation is close to the value expected for constant mass-to-light ratio, while in the visible it increases with mass. Equivalently we show that the infrared luminosity is a good tracer of the dynamical mass in galaxies, whereas the fraction of blue light decreases with increasing mass. (2) B - H increases with mass (H luminosity) for galaxies of a given Hubble type and, at fixed H luminosity, it is larger in early morphological types. (3) The present star-formation rate and the H I content per unit mass both decrease with increasing dynamical mass. We argue that the above findings have implications on the mechanism of galaxy formation, suggesting that the efficiency of conversion of the primordial mass into stars in the early phases of protogalaxy collapse increases with the dynamical mass of the system. Subject headings: galaxies: formation - galaxies: stellar content
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