The oxygen-II luminosity density of the Universe

Details The oxygen-II luminosity density of the Universe The oxygen-II luminosity density of the Universe

1998-04-14

arxiv.org/abs/astro-ph/9804129v1

Astronomy and Astrophysics

Astrophysics

accepted for publication in ApJ

Scientific paper

10.1086/306122

Equivalent widths of [OII] 3727 A lines are measured in 375 faint galaxy spectra taken as part of the Caltech Faint Galaxy Redshift Survey centered on the Hubble Deep Field. The sensitivity of the survey spectra to the [OII] line is computed as a function of magnitude, color and redshift. The luminosity function of galaxies in the [OII] line and the integrated luminosity density of the Universe in the [OII] line are computed as a function of redshift. It is found that the luminosity density in the [OII] line was a factor of ~10 higher at redshifts z~1 than it is at the present day. The simplest interpretation is that the star formation rate density of the Universe has declined dramatically since z~1.

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