The Distribution of [OII] Equivalent Widths of LCRS Galaxies

Details The Distribution of [OII] Equivalent Widths of LCRS Galaxies The Distribution of [OII] Equivalent Widths of LCRS Galaxies

2000-09-04

arxiv.org/abs/astro-ph/0009051v1

Astrophys.J. 543 (2000) L125-L128

Astronomy and Astrophysics

Astrophysics

8 pages, 1 figure, ApJ Letters, accepted

Scientific paper

10.1086/317283

We present a simple functional form for the joint distribution of R-band luminosity and [OII] 3727 emission-line equivalent widths of galaxies, and show that this form is a good fit to the galaxies in the Las Campanas Redshift Survey. We find a relationship between [OII] equivalent width W and R-band luminosity L_R of the approximate form: \approx (10 \AA) (L_R/L_{R,*})^{-1/2}, where L_{R,*} is the characteristic luminosity in the Schechter function. Because this joint distribution yields information about the relationship between stellar mass in a galaxy and its recent star-formation rate, it can be useful for testing theories of galaxy formation. Furthermore, understanding this joint distribution locally will make it easier to interpret the evolution of [OII] emission-line widths to higher redshifts.

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