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The Las Campanas Infrared Survey. III. The H-Band Imaging Survey and the Near-Infrared and Optical Photometric Catalogs

Chen, Hsiao-Wen and McCarthy, P. J. and Marzke, R. O. and Wilson, J. and Carlberg, R. G. and Firth, A. E. and Persson, S. E. and Sabbey, C. N. and Lewis, J. R. and McMahon, R. G. and Lahav, O. and Ellis, R. S. and Martini, P. and Abraham, R. G. and Oemler, A. and Murphy, D. C. and Somerville, R. S. and Beckett, M. G. and Mackay, C. D. (2002) The Las Campanas Infrared Survey. III. The H-Band Imaging Survey and the Near-Infrared and Optical Photometric Catalogs. Astrophysical Journal, 570 (1). pp. 54-74. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20130311-080312954

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Abstract

The Las Campanas Infrared Survey, based on broadband 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 deg^2 of sky in six separate fields. The average 5 σ detection limit in a 4" diameter aperture is H ~ 20.8. 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. The optical images of the Hubble Deep Field-South region obtained from the literature reach 5 σ detection thresholds in a 4" diameter aperture of U ~ 24.6, B ~ 26.1, V ~ 25.6, R ~ 25.1, and I ~ 24.2 mag. The optical images of the Chandra Deep Field-South region obtained from our own observations reach 5 σ detection thresholds in a 4" diameter aperture of V ~ 26.8, R ~ 26.2, I ~ 25.3, and z' ~ 23.7 mag. We perform object detection in all bandpasses and identify ≳ 54,000 galaxies over 1408 arcmin^2 of sky in the two fields. Of these galaxies, ~14,000 are detected in the H band and ~2000 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 d log N(m)/dm = 0.45 ± 0.01 mag^(-2) at H ≾ 19 and 0.27 ± 0.01 mag^(-2) at H ≳ 19, with a mean surface density ≈7200 deg^(-2) mag^(-1) at H = 19. In addition, we find that (2) the differential number counts for the H-band-detected red objects has a very steep slope, d log N(m; I - H ≳ 3)/dm = 0.84 ± 0.06 mag^(-2) at H ≾ 20 and 0.32 ± 0.07 mag^(-2) at H ≳ 20, with a mean surface density ≈3000 deg^(-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-band-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 ongoing star formation, as indicated by the large scatter in their V-I colors.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/339426DOIUNSPECIFIED
http://iopscience.iop.org/0004-637X/570/1/54/PublisherUNSPECIFIED
ORCID:
AuthorORCID
Ellis, R. S.0000-0001-7782-7071
Abraham, R. G.0000-0002-4542-921X
Additional Information:© 2002 American Astronomical Society. Received 2001 August 2; accepted 2002 January 2. We are grateful to Xiaohui Fan, Sandy Leggett, and Ben Oppenheimer for providing various digitized stellar templates of M dwarfs, L dwarfs, and T dwarfs, and to Ken Lanzetta for providing galaxy templates for the photometric redshift analysis. We appreciate the expert assistance from the staffs of the Cerro Tololo Inter-American Observatory and Las Campanas Observatory. This research was supported by the National Science Foundation under grant AST 99-00806. The CIRSI camera was made possible by the generous support of the Raymond and Beverly Sackler Foundation.
Funders:
Funding AgencyGrant Number
NSFAST 99-00806
Raymond and Beverly Sackler FoundationUNSPECIFIED
Subject Keywords:catalogs, cosmology: observations, galaxies: evolution, galaxies: high-redshift, infrared: galaxies, surveys
Issue or Number:1
Record Number:CaltechAUTHORS:20130311-080312954
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130311-080312954
Official Citation:The Las Campanas Infrared Survey. III. The H-Band Imaging Survey and the Near-Infrared and Optical Photometric Catalogs Hsiao-Wen Chen et al. 2002 ApJ 570 54
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37429
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Mar 2013 16:55
Last Modified:09 Mar 2020 13:18

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