Spectral Analysis of the Stromlo-APM Survey II. Galaxy luminosity function and clustering by spectral type

Abstract

We study the luminosity function and clustering properties of subsamples of local galaxies selected from the Stromlo-APM survey by the rest-frame equivalent widths of their Halpha and Oii emission lines. The b_J luminosity function of star-forming galaxies has a significantly steeper faint-end slope than that for quiescent galaxies: the majority of sub-L* galaxies are currently undergoing significant star formation. Emission line galaxies are less strongly clustered, both amongst themselves, and with the general galaxy population, than quiescent galaxies. Thus as well as being less luminous, star-forming galaxies also inhabit lower-density regions of the Universe than quiescent galaxies.

arXiv comment8 pages, 7 figures, MNRAS, in press

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