The [O II] lambda 3727 Luminosity Function at z ~ 1

Details The [O II] lambda 3727 Luminosity Function at z ~ 1 The [O II] lambda 3727 Luminosity Function at z ~ 1

2008-11-19

arxiv.org/abs/0811.3035v3

Astrophys.J.701:86-93,2009

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, 2 tables, resubmitted to ApJ, in emulateapj style. Comparison with narrow-band observations added. Wavele

Scientific paper

10.1088/0004-637X/701/1/86

We measure the evolution of the [OII]lambda 3727 luminosity function at 0.75~2.5 between z ~ 1.35 and z ~ 0.84. In the limit of no number-density evolution, the characteristic [OII] luminosity, L^*_[OII], defined as the luminosity where the space density equals 10^{-3.5} dex^{-1} Mpc^{-3}, declines by a factor of ~1.8 over the same redshift interval. Assuming that L_[OII] is proportional to the star-formation rate (SFR), and negligible change in the typical dust attenuation in galaxies at fixed [OII] luminosity, the measured decline in L^*_[OII] implies a ~25% per Gyr decrease in the amount of star formation in galaxies during this epoch. Adopting a faint-end power-law slope of -1.3\pm0.2, we derive the comoving SFR density in four redshift bins centered around z~1 by integrating the observed [OII] luminosity function using a local, empirical calibration between L_[OII] and SFR, which statistically accounts for variations in dust attenuation and metallicity among galaxies. We find that our estimate of the SFR density at z~1 is consistent with previous measurements based on a variety of independent SFR indicators.

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