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The Las Campanas Infrared Survey. III. The H-band Imaging Survey and the Near-Infrared and Optical Photometric Catalogs | | Hsiao-Wen Chen
; P. J. McCarthy
; R. O. Marzke J. Wilson
; R. G. Carlberg
; A. E. Firth
; S. E. Persson
; C. N. Sabbey
; J. R. Lewis
; R. G. McMahon
; O. Lahav
; R. S. Ellis
; P. Martini
; R. G. Abraham
; A. Oemler
; D. C. Murphy
; R. S. Somerville
; M. G. Beckett
; C. D. Mackay
; | | Date: |
10 Aug 2001 | | Journal: | Astrophys.J. 570 (2002) 54-74 | | Subject: | astro-ph | | Affiliation: | 1,3) J. Wilson , R. G. Carlberg , A. E. Firth , S. E. Persson , C. N. Sabbey , J. R. Lewis , R. G. McMahon , O. Lahav , R. S. Ellis , P. Martini , R. G. Abraham , A. Oemler , D. C. Murphy , R. S. Somerville , M. G. Beckett (1,4), C. D. Mackay ( Carne | | Abstract: | (Abridged) The Las Campanas Infrared Survey, based on broad-band optical and near-infrared photometry, is designed to robustly identify a statistically significant and representative sample of evolved galaxies at redshifts z>1. We have completed an H-band imaging survey over 1.1 square degrees of sky in six separate fields. The average 5 sigma detection limit in a four arcsecond diameter aperture is H ~ 20. Here we describe the design of the survey, the observation strategies, data reduction techniques, and object identification procedures. We present sample near-infrared and optical photometric catalogs for objects identified in two survey fields. We perform object detection in all bandpasses and identify ~ 54,000 galaxies over 1,408 square arcminutes of sky in the two fields. Of these galaxies, ~ 14,000 are detected in the H-band and ~ 2,000 have the colors of evolved galaxies, I - H >3, at z > 1. We find that (1) the differential number counts N(m) for the H-band detected objects has a slope of 0.44 at H < 19 and 0.27 for H > 19. In addition, we find that (2) the differential number counts for the H detected red objects has a slope of 0.85 at H < 20 and 0.32 at H > 20, with a mean surface density ~ 3,000 degree^{-2} mag^{-1} at H=20. Finally, we find that (3) galaxies with red optical to near-IR colors (I-H > 3) constitute ~ 20% of the H detected galaxies at H ~ 21, but only 2% at H = 19. We show that red galaxies are strongly clustered, which results in a strong field to field variation in their surface density. Comparisons of observations and predictions based on various formation scenarios indicate that these red galaxies are consistent with mildly evolving early-type galaxies at z ~ 1, although with a significant amount of on-going star formation as indicated by the large scatter in their V-I colors. | | Source: | arXiv, astro-ph/0108171 | | Services: | Forum | Review | PDF | Favorites | |
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