Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-12-18
Astron.J. 125 (2003) 1682
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomical Journal
Scientific paper
10.1086/368135
The morphological dependence of the luminosity function is studied using a sample containing approximately 1500 bright galaxies classified into Hubble types by visual inspections for a homogeneous sample obtained from the Sloan Digital Sky Survey (SDSS) northern equatorial stripes. Early-type galaxies are shown to have a characteristic magnitude by 0.45 mag brighter than spiral galaxies in the $r^{\ast}$ band, consistent with the `universal characteristic luminosity' in the $B$ band. The shape of the luminosity function differs rather little among different morphological types: we do not see any symptoms of the sharp decline in the faint end for the luminosity function for early-type galaxies at least 2 mag fainter than the characteristic magnitude, although the faint end behaviour shows a slight decline ($\alpha\lsim -1$) compared with the total sample. We also show that a rather flat faint end slope for early-type galaxies is not due to an increasing mixture of the dwarf galaxies which have softer cores. This means that there are numerous faint early-type galaxies with highly concentrated cores.
Brinkmann Jon
Fukugita Masataka
Loveday Jon
Nakamura Osamu
Schneider Donald P.
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