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Extremely Red Objects in the Lockman Hole
Wilson, Graham Wallace Huang, J. S. Pérez-González, P. G. Egami, E. Ivison, R. J. Rigby, J. R. Alonso-Herrero, A. Barmby, P. Dole, H. Fazio, G. G.
Wilson, Graham Wallace
Huang, J. S.
Pérez-González, P. G.
Egami, E.
Ivison, R. J.
Rigby, J. R.
Alonso-Herrero, A.
Barmby, P.
Dole, H.
Fazio, G. G.
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Abstract
We investigate extremely red objects (EROs) using near- and mid-infrared observations in five passbands (3.6 to 24 μm) obtained from the Spitzer Space Telescope, and deep ground-based R and K imaging. The great sensitivity of the Infrared Array Camera (IRAC) camera allows us to detect 64 EROs (a surface density of 2.90 ± 0.36 arcmin-2; [3.6]AB < 23.7) 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 μm to be EROs. These percentages rise to about 40% at 5.8 μm, and about 60% at 8.0 μm. We utilize the spectral bump at 1.6 μm to divide the EROs into broad redshift slices using only near-infrared colors (2.2/3.6/4.5 μm). We conclude that two-thirds of all EROs lie at redshift z > 1.3. Detections at 24 μm 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.
Description
This is the published version, also available here: http://dx.doi.org/10.1086/422716.
Date
2004-05-21
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American Astronomical Society
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Keywords
Cosmology, observations, evolution, high-redshift, galaxies, photometry, starburst, infrared: galaxies
Citation
G. Wilson et al. "Extremely Red Objects in the Lockman Hole." (2004) ApJS. 154. 107 http://dx.doi.org/10.1086/422716.