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    Spectral Energy Distribution Fitting Of HETDEX Pilot Survey Ly Alpha Emitters In Cosmos And GOODS-N

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    2014_05_spectral.pdf (3.043Mb)
    Date
    2014-05
    Author
    Hagen, Alex
    Ciardullo, Robin
    Gronwall, Caryl
    Acquaviva, Viviana
    Bridge, Joanna
    Zeimann, Gregory R.
    Blanc, Guillermo A.
    Bond, Nicholas A.
    Finkelstein, Steven L.
    Song, Mimi
    Gawiser, Eric
    Fox, Derek B.
    Gebhardt, Henry
    Malz, A. I.
    Schneider, Donald P.
    Drory, Niv
    Gebhardt, Karl
    Hill, Gary J.
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    Abstract
    We use broadband photometry extending from the rest-frame UV to the near-IR to fit the individual spectral energy distributions of 63 bright (L(Ly alpha) > 10(43) erg s(-1)) Ly alpha emitting galaxies (LAEs) in the redshift range 1.9 < z < 3.6. We find that these LAEs are quite heterogeneous, with stellar masses that span over three orders of magnitude, from 7.5 < log M/M-circle dot < 10.5. Moreover, although most LAEs have small amounts of extinction, some high-mass objects have stellar reddenings as large as E(B - V) similar to 0.4. Interestingly, in dusty objects the optical depths for Ly alpha and the UV continuum are always similar, indicating that Ly alpha photons are not undergoing many scatters before escaping their galaxy. In contrast, the ratio of optical depths in low-reddening systems can vary widely, illustrating the diverse nature of the systems. Finally, we show that in the star-formation-rate-log-mass diagram, our LAEs fall above the "main-sequence" defined by z similar to 3 continuum selected star-forming galaxies. In this respect, they are similar to submillimeter-selected galaxies, although most LAEs have much lower mass.
    Department
    Astronomy
    Subject
    cosmology: observations
    galaxies: evolution
    galaxies: high-redshift
    galaxies: starburst
    lyman break galaxies
    star-formation histories
    emission-line galaxies
    high-redshift galaxies
    extragalactic legacy survey
    initial mass
    function
    emitting galaxies
    stellar mass
    morphological properties
    submillimeter galaxies
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34648
    Citation
    Hagen, Alex, Robin Ciardullo, Caryl Gronwall, Viviana Acquaviva, Joanna Bridge, Gregory R. Zeimann, Guillermo A. Blanc et al. "Spectral Energy Distribution Fitting of HETDEX Pilot Survey Ly? Emitters in COSMOS and GOODS-N." The Astrophysical Journal, Vol. 786, No. 1 (May., 2014): 59.
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