The [O II] λ3727 luminosity function at z 1

Guangtun Zhu, John Moustakas, Michael R. Blanton

    Research output: Contribution to journalArticle

    Abstract

    We measure the evolution of the [O II] λ3727 luminosity function (LF) at 0.75 < z < 1.45 using high-resolution spectroscopy of 14,000 galaxies observed by the Deep Extragalactic Evolutionary Probe 2 galaxy redshift survey. We find that brighter than the LF is well represented by a power law dN/dL L α with slope α -3. The number density of [O II]-emitting galaxies above this luminosity declines by a factor of ≳2.5 between z ∼ 1.35 and z ∼ 0.84. In the limit of no number-density evolution, the characteristic [O II] luminosity, , 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 is proportional to the star formation rate (SFR), and negligible change in the typical dust attenuation in galaxies at fixed [O II] luminosity, the measured decline in 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 ± 0.2, we derive the comoving SFR density in four redshift bins centered around z 1 by integrating the observed [O II] LF using a local, empirical calibration between 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.

    Original languageEnglish (US)
    Pages (from-to)86-93
    Number of pages8
    JournalAstrophysical Journal
    Volume701
    Issue number1
    DOIs
    StatePublished - Jan 1 2009

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    Keywords

    • Galaxies: Evolution
    • Galaxies: luminosity function, mass function
    • Stars: formation

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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