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The Extremely Red Objects Found Thus Far in the Caltech Faint Galaxy Redshift Survey

Cohen, Judith G. and Hogg, David W. and Blandford, Roger and Pahre, Michael A. and Shopbell, Patrick L. (1999) The Extremely Red Objects Found Thus Far in the Caltech Faint Galaxy Redshift Survey. In: Astrophysics with Infrared Surveys: A Prelude to SIRTF. Astronomical Society of the Pacific Conference Series. No.177. Astronomical Society of the Pacific , San Francisco, CA, pp. 47-50. ISBN 9781583810019.

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We discuss the very red objects found in the first field of the Caltech Faint Galaxy Redshift Survey, for which the observations and analysis are now complete. In this field, which is 15 arcmin^2 and at J005325+1234 there are 195 objects with K_s < 20 mag, of which 84% have redshifts. The sample includes 24 spectroscopically confirmed Galactic stars, 136 galaxies, three AGNs, and 32 objects without redshifts. About 10% of the sample has (R−K) ≥ 5 mag. Four of these objects have redshifts, with 0.78 ≤ z ≤ 1.23. Three of these are based on absorption features in the mid-UV, while the lowest redshift object shows the standard features near 4000Å. Many of the objects still without redshifts have been observed spectroscopically, and no emission lines were seen in their spectra. We believe they are galaxies with z ∼1−1.5 that are red due to their age and stellar content and not to some large amount of internal reddening from dust. Among the many other results from this survey of interest here is a determination of the median extinction in the mid-UV for objects with strong emission line spectra at z ∼1−1.3. The result is extinction by a factor of ∼2 at 2400 Å.

Item Type:Book Section
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URLURL TypeDescription Paper
Cohen, Judith G.0000-0002-8039-4673
Hogg, David W.0000-0003-2866-9403
Blandford, Roger0000-0002-1854-5506
Additional Information:© 1999 Astronomical Society of the Pacific. Provided by the NASA Astrophysics Data System. Based in large part on observations obtained at the W.M. Keck Observatory, which is operated jointly by the California Institute of Technology and the University of California. The entire Keck/LRIS user community owes a huge debt to Jerry Nelson, Gerry Smith, Bev Oke, and many other people who have worked to make the Keck Telescope and LRIS a reality. We are grateful to the W. M. Keck Foundation, and particularly its late president, Howard Keck, for the vision to fund the construction of the W. M. Keck Observatory. JGC is grateful for partial support from STScI/NASA grant AR-06337.12-94A. DWH and MAP were supported in part by Hubble Fellowship grants HF-01093.01-97A and HF-01099.01-97A from STScI (which is operated by AURA under NASA contract NAS5-26555).
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
NASA Hubble FellowshipHF-01093.01-97A
NASA Hubble FellowshipHF-01099.01-97A
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:177
Record Number:CaltechAUTHORS:20190524-105032925
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95786
Deposited By: Tony Diaz
Deposited On:24 May 2019 18:02
Last Modified:03 Oct 2019 21:16

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