Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415l..87d&link_type=abstract
Astrophysical Journal Letters v.415, p.L87
Astronomy and Astrophysics
Astronomy
26
Galaxies: Evolution, Galaxies: Interactions, Galaxies: Luminosity Function, Mass Function
Scientific paper
The population of "excess" faint blue galaxies with B < 24 cannot be removed through merging between z ~ 0.35 and the present. At z = 0.35, the B luminosity density of galaxies with L > 0.1L^*^ is 2-5 times greater than the local luminosity density. While merging can reduce the number density of galaxies, it cannot substantially change the luminosity density. I show that the luminosity density of the merged galaxies would exceed the total luminosity in ellipticals (the likely merger products), even when there has been substantial fading of the faint galaxies. Likewise, there is not enough mass in spiral galaxies to have accreted these galaxies without heating the disks beyond what is observed. Assuming that the faint blue galaxies fade by {DELTA}B = 2.2 and have mass-to-light ratios typical of irregular galaxies, only 5%-15% of the mass in galaxies at z = 0.35 can have merged into the local population of elliptical and spiral galaxies. These arguments are independent of the correlation function of the faint blue galaxies and the recent history of the merger rate, and they are valid for 0 < {OMEGA} < 1.
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