Spitzer Constraints on the z=6.56 Galaxy Lensed by Abell 370

Details Spitzer Constraints on the z=6.56 Galaxy Lensed by Abell 370 Spitzer Constraints on the z=6.56 Galaxy Lensed by Abell 370

2005-10-30

arxiv.org/abs/astro-ph/0510827v1

Astrophys.J.635:L5-L8,2005

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, ApJ Letters in press

Scientific paper

10.1086/499205

We report on Spitzer IRAC observations of the spectroscopically confirmed z=6.56 lensed Ly-alpha emitting source HCM 6A which was found behind the cluster Abell 370. Detection of the source at 3.6 and 4.5 microns, corresponding to rest-frame optical emission, allows us to study the stellar population of this primeval galaxy. The broadband flux density at 4.5 microns is enhanced compared to the continuum at other wavelengths, likely due to the presence of strong H-alpha in emission. The derived H-alpha line flux corresponds to a star-formation rate of around 140 M_{sun}/yr, more than an order of magnitude larger than estimates from the ultraviolet continuum and Ly-alpha emission line. The dust extinction required to explain the discrepancy is A_V of about 1 mag. The inference of dust at such high redshifts is surprising and implies that the first epoch of star-formation in this galaxy occurred at z~20.

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