SIMBAD references

2005ApJ...635L...5C - Astrophys. J., 635, L5-L8 (2005/December-2)

Spitzer constraints on the z = 6.56 galaxy lensed by Abell 370.


Abstract (from CDS):

We report on Spitzer IRAC observations of the spectroscopically confirmed z=6.56 lensed Lyα emitting source HCM 6A that was found behind the cluster Abell 370. Detection of the source at 3.6 and 4.5 µm, corresponding to rest-frame optical emission, allows us to study the stellar population of this primeval galaxy. The broadband flux density at 4.5 µm is enhanced compared to the continuum at other wavelengths, likely due to the presence of strong Hα in emission. The derived Hα line flux corresponds to a star formation rate of ≳140 M/yr, more than an order of magnitude larger than estimates from the ultraviolet continuum and Lyα emission line. The dust extinction required to explain the discrepancy is AV∼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.

Abstract Copyright:

Journal keyword(s): Cosmology: Observations - Cosmology: Early Universe - Galaxies: Evolution - Galaxies: Formation - Galaxies: High-Redshift - galaxies: individual (HCM 6A)

Status at CDS:  

Simbad objects: 2

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