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Paper: Spitzer Constraints on the Stellar Population of Lyα Emitting Galaxies at z ∼ 5.7
Volume: 380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page: 83
Authors: Lai, K.; Huang, J.-S.; Fazio, G.; Cowie, L.L.; Hu, E.M.; Kakazu, Y.
Abstract: We present a study of three high-redshift Lyα emitting galaxies, selected via a narrow-band survey in the GOODS northern field, and spectroscopically confirmed to have redshifts z ~ 5.7. Using HST ACS and Spitzer IRAC data, we constrain the rest-frame UV-to-optical spectral energy distributions (SEDs) of the galaxies. Fitting stellar population synthesis models to the observed SEDs, we find the galaxies have stellar masses ~ 109 − 1010 M and ages ~ 5 − 100 Myr, assuming a simple starburst star formation history. If a constant star formation rate model is considered, then ages as old as 700 Myr are allowed. A comparison of our narrow-band selected objects to other IRAC-detected z ~ 6 i′-dropout galaxies reveal similar z − [3.6] colors and 3.6 μm magnitudes between the two populations, suggesting that they possess stellar populations of similar masses and ages. The observed similarity may be the re- sult of a selection bias, since the IRAC-detected objects only sample the bright end of the luminosity function.
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