Caltech Faint Galaxy Redshift Survey. IX. Source detection and photometry in the Hubble Deep Field region

Detection and photometry of sources in the U-n, G, R, and K-s bands in a 9 x 9 arcmin(2) region of the sky, centered on the Hubble Deep Field, are des cribed. The data permit construction of complete photometric catalogs to ro ughly U-n = 25, G = 26, R = 25.5, K-s = 20 mag and significant photometric measurements somewhat fainter. The galaxy number density is 1.3 x 10(5) deg (-2) to R = 25.0 mag. Galaxy number counts have slopes d log N/dm = 0.42, 0 .33, 0.27, and 0.31 in the U-n, G, R, and K-s bands, consistent with previo us studies and the trend that fainter galaxies are, on average, bluer. Gala xy catalogs selected in the R and K-s bands are presented, containing 3607 and 488 sources in held areas of 74.8 and 59.4 arcmin(2), to R = 25.5 and K -s = 20 mag.