Confirming a z~10 galaxy with IRAC

Details Confirming a z~10 galaxy with IRAC Confirming a z~10 galaxy with IRAC

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..296m&link_type=abstract

Spitzer Proposal ID #296

Physics

Scientific paper

The NICMOS Parallel Survey covered enough sky to find rare, luminous J-dropout Lyman Break Galaxies (LBGs) at z>8. We used IRAC to observe six LBG candidates with extemely red J110-H160 colors. One of these has the blue H160 - IRAC2 color expected of a z=10 galaxy. It remains undetected in IRAC1, suggesting the presence a Balmer/4000 Angstrom break. These extreme colors make this galaxy the best known z=10 candidate. The best fit photometric redshift is z=9.6, although some degeneracy remains, and the galaxy can be fit (less well) by a z=2.5 model. To break this degneracy, we propose deep IRAC observations to detect the source in channels 1 and 3. With this five point SED, we will not only determine the redshift- we will also constrain properties such as extinction. If this galaxy is confirmed as a z=10 LBG, it has important implications for galaxy formation and models which describe the reionization of the intergalactic medium.

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