THE SPECTRAL ENERGY DISTRIBUTIONS OF z ~ 8 GALAXIES FROM THE IRAC ULTRA DEEP FIELDS: EMISSION LINES, STELLAR MASSES, AND SPECIFIC STAR FORMATION RATES AT 650 MYR

Using new ultradeep Spitzer/InfraRed Array Camera (IRAC) photometry from the IRAC Ultra Deep Field program, we investigate the stellar populations of a sample of 63 Y-dropout galaxy candidates at z ~ 8, only 650 Myr after the big bang. The sources are selected from HST/ACS + WFC3/IR data over the Hu...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2013-11, Vol.777 (2), p.1-6
Main Authors: Labbe, I, Oesch, P A, Bouwens, R J, Illingworth, G D, Magee, D, Gonzalez, V, Carollo, C M, Franx, M, TRENTI, M, van Dokkum, P G, STIAVELLI, M
Format: Article
Language:English
Subjects:
Arrays
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CAMERAS
DENSITY
DEPTH
Emission
ENERGY SPECTRA
FIELD EMISSION
GALAXIES
Infrared
MASS
RED SHIFT
Spectral emissivity
Spectral energy distribution
STARS
Stellar mass
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Summary:Using new ultradeep Spitzer/InfraRed Array Camera (IRAC) photometry from the IRAC Ultra Deep Field program, we investigate the stellar populations of a sample of 63 Y-dropout galaxy candidates at z ~ 8, only 650 Myr after the big bang. The sources are selected from HST/ACS + WFC3/IR data over the Hubble Ultra Deep Field (HUDF), two HUDF parallel fields, and wide area data over the CANDELS/GOODS-South. Correcting the spectral energy distribution for the contribution of emission lines lowers the average best-fit stellar masses and mass-to-light ratios by ~3, decreasing the integrated stellar mass density to [rho][sup *](z=8, MUV
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/777/2/L19