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Title: Extremely red objects in the Lockman Hole
Authors: Wilson, G.
Huang, J.-S.
Perez-Gonzalez, P. G.
Egami, E.
Ivison, R. J.
Rigby, J. R.
Alonso-Herrero, A.
Barmby, P.
Dole, H.
Fazio, G. G.
Le Floch, 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.
Keywords: cosmology
Issue Date: Sep-2004
Publisher: The American Astronomical Society
Citation: The Astrophysical Journal Supplement Series, 154:107–111, 2004 September doi: 10.1086/422716
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.
Appears in Collections:JPL TRS 1992+

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