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