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    The HETDEX Pilot Survey. IV. The Evolution Of O II Emitting Galaxies From Z Similar To 0.5 To Z Similar To 0

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    2013_03_hetdexpilotsurveyiv.pdf (786.2Kb)
    Date
    2013-05
    Author
    Ciardullo, Robin
    Gronwall, Caryl
    Adams, Joshua J.
    Blanc, Guillermo A.
    Gebhardt, Karl
    Finkelstein, Steven L.
    Jogee, Shardha
    Hill, Gary J.
    Drory, Niv
    Hopp, Ulrich
    Schneider, Donald P.
    Zeimann, Gregory R.
    Dalton, Gavin B.
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    Abstract
    We present an analysis of the luminosities and equivalent widths of the 284 z < 0.56 [O II]-emitting galaxies found in the 169 arcmin(2) pilot survey for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). By combining emission-line fluxes obtained from the Mitchell spectrograph on the McDonald 2.7 m telescope with deep broadband photometry from archival data, we derive each galaxy's dereddened [O II] lambda 3727 luminosity and calculate its total star formation rate. We show that over the last similar to 5Gyr of cosmic time, there has been substantial evolution in the [O II] emission-line luminosity function, with L* decreasing by similar to 0.6 +/- 0.2 dex in the observed function, and by similar to 0.9 +/- 0.2 dex in the dereddened relation. Accompanying this decline is a significant shift in the distribution of [O II] equivalent widths, with the fraction of high equivalent-width emitters declining dramatically with time. Overall, the data imply that the relative intensity of star formation within galaxies has decreased over the past similar to 5Gyr, and that the star formation rate density of the universe has declined by a factor of similar to 2.5 between z similar to 0.5 and z similar to 0. These observations represent the first [O II]-based star formation rate density measurements in this redshift range, and foreshadow the advancements which will be generated by the main HETDEX survey.
    Department
    Astronomy
    Subject
    cosmology: observations
    galaxies: evolution
    galaxies: formation
    galaxies: luminosity function, mass function
    star-formation rate
    emission-line galaxies
    lambda-3727 luminosity
    function
    infrared cluster survey
    france redshift survey
    subaru deep
    field
    h-alpha
    formation history
    forming galaxies
    ultraviolet
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34954
    Citation
    Ciardullo, Robin, Caryl Gronwall, Joshua J. Adams, Guillermo A. Blanc, Karl Gebhardt, Steven L. Finkelstein, Shardha Jogee et al. "The Hetdex Pilot Survey. IV. The evolution of [O II] emitting galaxies from z~ 0.5 to z~ 0." The Astrophysical Journal, Vol. 769, No. 1 (May., 2013): 83.
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    • facebook
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