Spectroscopic Confirmation of z 6 i-band Dropout Galaxies in the RDCSJ1252-2927 and UDF-Parallel ACS Fields

Details Spectroscopic Confirmation of z 6 i-band Dropout Galaxies in the RDCSJ1252-2927 and UDF-Parallel ACS Fields Spectroscopic Confirmation of z 6 i-band Dropout Galaxies in the RDCSJ1252-2927 and UDF-Parallel ACS Fields

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.9419d&link_type=abstract

American Astronomical Society Meeting 205, #94.19; Bulletin of the American Astronomical Society, Vol. 36, p.1498

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Scientific paper

We have selected a sample of 22 potential z 6 galaxies from HST ACS imaging using the Lyman break technique. We present deep LRIS and FORS2 spectroscopy for these objects, with exposures of up to 24 hours. For our brightest galaxy (z850,AB=24.3, z=5.515), there is clear evidence for significant metal absorption line features similar to starbursting galaxies at lower redshifts. We believe this to be the highest redshift absorption spectrum acquired to date of a Lyman break galaxy. Furthermore, a continuum spectrum of another object (z850,AB=25.6, z=5.8) will also be shown and it similarly lacks a strong Lyman-alpha emission component. Two significant trends seen in our sample are (i) objects that possess strong Lyman-alpha emission have relatively low star formation rates, and (ii) these objects compose approximately 25% of the LBG's at z 6. Lyman-alpha emitters appear to be a poor representation of the star-forming populace at this epoch, implying that broadband selection techniques are critical for obtaining statistically relevant samples of z 6 objects.

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