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Title:
Extremely Red Objects in the Lockman Hole
Authors:
Wilson, G.; 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.; Le Floc'h, E.; Papovich, C.; Rigopoulou, D.; Bai, L.; Engelbracht, C. W.; Frayer, D.; Gordon, K. D.; Hines, D. C.; Misselt, K. A.; Miyazaki, S.; Morrison, J. E.; Rieke, G. H.; Rieke, M. J.; Surace, J.
Affiliation:
AA(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125; .), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AC(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AD(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AE(Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK.), AF(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AG(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AI(Steward Observatory, University of Arizona, Tucson, AZ 85721.; Institut d'Astrophysique Spatiale, bat 121, Universiteé Paris Sud, F-91405 Orsay Cedex, France.), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AK(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AL(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AM(Department of Astrophysics, Oxford University, Keble Road, Oxford, OX1 3RH, UK.), AN(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AO(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AP(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125; .), AQ(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AR(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AS(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AT(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AU(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AV(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AW(Steward Observatory, University of Arizona, Tucson, AZ 85721.), AX(Spitzer Science Center, California Institute of Technology, 220-6, Pasadena, CA 91125; .)
Publication:
The Astrophysical Journal Supplement Series, Volume 154, Issue 1, pp. 107-111. (ApJS Homepage)
Publication Date:
09/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Photometry, Galaxies: Starburst, Infrared: Galaxies
DOI:
10.1086/422716
Bibliographic Code:
2004ApJS..154..107W

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.
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