Spectroscopy of an Exceptionally Bright Candidate Galaxy at z 6 in Abell 1703

Details Spectroscopy of an Exceptionally Bright Candidate Galaxy at z 6 in Abell 1703 Spectroscopy of an Exceptionally Bright Candidate Galaxy at z 6 in Abell 1703

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..326f&link_type=abstract

NOAO Proposal ID #2009A-0326

Computer Science

Scientific paper

We have discovered a close pair of bright i-dropout candidates, which we call A1703-iD1, in the HST/ACS, Gemini-N/NIRI, and HST/NICMOS images of Abell 1703. This object was found as a result of our extensive search for high-z galaxies in clusters over a sky area comparable to GOODS. A1703-iD1, with a combined magnitude of AB(z850)=23.9 and a photometric redshift of 6.1, may be the brightest high-z galaxy known to date, corresponding to an unmagnified galaxy with luminosity 10 L*. The GMOS spectrum will enable us to search for emission and absorption features in A1703-iD1, and compare them with those at lower redshifts to study the evolution of the metallicity in the gas ejected by the stars in extremely young galaxies. During the long exposure of our main target, we will also obtain 35 spectra of spectacular arcs in the cluster field. These spectra will enable us to improve our mass model to map the dark matter in this cluster. We were granted time in 2008A, but the observations were not carried out.

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