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29 March 2024
 
  » arxiv » astro-ph/0405612

 Article overview


Extremely Red Objects in The Lockman Hole
G. Wilson ; J.-S. Huang ; P. G. Perez-Gonzalez ; E. Egami ; R. J. Ivison ; J. R. Rigby ; A. Alonso-Herrero ; P. Barmby ; H. Dole ; G. G. Fazio ; E. Le Floc’h ; C. Papovich ; D. Rigopoulou ; L. Bai ; C. W. Engelbracht ; D. Frayer ; K. D. Gordon ; D. C. Hines ; K. A. Misselt ; S. Miyazaki ; J. E. Morrison ; G. H. Rieke ; M. J. Rieke ; J. Surace ;
Date 31 May 2004
Subject astro-ph
Affiliation3,5), G. G. Fazio , E. Le Floc’h , C. Papovich , D. Rigopoulou , L. Bai , C. W. Engelbracht , D. Frayer , K. D. Gordon , D. C. Hines , K. A. Misselt , S. Miyazaki , J. E. Morrison , G. H. Rieke , M. J. Rieke and J. Surace ( Spitzer Science Cen
AbstractWe investigate Extremely Red Objects (EROs) using near- and mid-infrared observations in five passbands (3.6 to 24 micron) obtained from the Spitzer Space Telescope, and deep ground-based R and K imaging. The great sensitivity of the IRAC camera allows us to detect 64 EROs in only 12 minutes of IRAC exposure time, by means of an R-[3.6] color cut (analogous to the traditional red R-K cut). A pure infrared K-[3.6] red cut detects a somewhat different population and may be more effective at selecting z > 1.3 EROs. We find 17% of all galaxies detected by IRAC at 3.6 or 4.5 micron to be EROs. These percentages rise to about 40% at 5.8 micron, and about 60% at 8.0 micron. We utilize the spectral bump at 1.6 micron to divide the EROs into broad redshift slices using only near-infrared colors (2.2/3.6/4.5 micron). We conclude that two-thirds of all EROs lie at redshift z > 1.3. Detections at 24 micron imply that at least 11% of 0.6 < z < 1.3 EROs and at least 22% of z > 1.3 EROs are dusty star-forming galaxies.
Source arXiv, astro-ph/0405612
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