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Extremely red objects in the Lockman Hole

Show simple item record 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. 2008-07-31T22:37:05Z 2008-07-31T22:37:05Z 2004-09
dc.identifier.citation The Astrophysical Journal Supplement Series, 154:107–111, 2004 September doi: 10.1086/422716 en_US
dc.identifier.clearanceno 04-1752
dc.description.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. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher The American Astronomical Society en_US
dc.subject cosmology en_US
dc.subject galaxies en_US
dc.subject photometry en_US
dc.subject starburst en_US
dc.title Extremely red objects in the Lockman Hole en_US
dc.type Article en_US

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