Caltech Faint Field Galaxy Redshift Survey IX: Source detection and photometry in the Hubble Deep Field Region
Abstract
Detection and photometry of sources in the Un, G, R, and Ks bands in a 9x9 arcmin2 region of the sky, centered on the Hubble Deep Field, are described. The data permit construction of complete photometric catalogs to roughly Un=25, G=26, R=25.5 and Ks=20 mag, and significant photometric measurements somewhat fainter. The galaxy number density is 1.3x105 deg-2 to R=25.0 mag. Galaxy number counts have slopes dlog N/dm=0.42, 0.33, 0.27 and 0.31 in the Un, G, R and Ks bands, consistent with previous studies and the trend that fainter galaxies are, on average, bluer. Galaxy catalogs selected in the R and Ks bands are presented, containing 3607 and 488 sources, in field areas of 74.8 and 59.4 arcmin2, to R=25.5 and and Ks=20 mag.
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