The relative contributions of bulge and disk to the luminosity density of the universe

Details The relative contributions of bulge and disk to the luminosity density of the universe The relative contributions of bulge and disk to the luminosity density of the universe

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..563s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Sept. 1987, p. 563-570.

Astronomy and Astrophysics

Astronomy

73

Disk Galaxies, Galactic Radiation, Luminosity, Astronomical Models, Mass To Light Ratios, Red Shift

Scientific paper

The authors have obtained redshifts for a virtually complete, magnitude-limited sample of galaxies in a set of randomly chosen fields. They use these in conjunction with previously measured bulge-to-disk ratios to determine the dependence of blue bulge-to-disk ratio on absolute magnitude, and the relative contributions of bulge and disk to the mean luminosity density of the universe. Through there is considerable scatter in bulge-to-disk ratio at all absolute magnitudes, the authors find that B/D varies as 0.61 (L/L*)0.28. When the different mass-to-light ratios of bulge and disk are taken into account, they find that roughly equal amounts of mass are incorporated in bulges and disks.

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