Extremely red objects in the Lockman hole

G. Wilson; J. S. Huang; P. G. Pérez-González; 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

doi:10.1086/422716

Extremely red objects in the Lockman hole

G. Wilson, J. S. Huang, P. G. Pérez-González, 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. MiyazakiJ. E. Morrison, G. H. Rieke, M. J. Rieke, J. Surace

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

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.

Original language	English (US)
Pages (from-to)	107-111
Number of pages	5
Journal	Astrophysical Journal, Supplement Series
Volume	154
Issue number	1
DOIs	https://doi.org/10.1086/422716
State	Published - Sep 2004

Keywords

Cosmology: Observations
Galaxies: Evolution
Galaxies: High-redshift
Galaxies: Photometry
Galaxies: Starburst
Infrared: Galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/422716

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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., ... Surace, J. (2004). Extremely red objects in the Lockman hole. Astrophysical Journal, Supplement Series, 154(1), 107-111. https://doi.org/10.1086/422716

Wilson, G, Huang, JS, Pérez-González, PG, Egami, E, Ivison, RJ, Rigby, JR, Alonso-Herrero, A, Barmby, P, Dole, H, Fazio, GG, Le Floc'h, E, Papovich, C, Rigopoulou, D, Bai, L, Engelbracht, CW, Frayer, D, Gordon, KD, Hines, DC, Misselt, KA, Miyazaki, S, Morrison, JE, Rieke, GH , Rieke, MJ & Surace, J 2004, 'Extremely red objects in the Lockman hole', Astrophysical Journal, Supplement Series, vol. 154, no. 1, pp. 107-111. https://doi.org/10.1086/422716

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title = "Extremely red objects in the Lockman hole",

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.",

keywords = "Cosmology: Observations, Galaxies: Evolution, Galaxies: High-redshift, Galaxies: Photometry, Galaxies: Starburst, Infrared: Galaxies",

author = "G. Wilson and Huang, {J. S.} and P{\'e}rez-Gonz{\'a}lez, {P. G.} and E. Egami and Ivison, {R. J.} and Rigby, {J. R.} and A. Alonso-Herrero and P. Barmby and H. Dole and Fazio, {G. G.} and {Le Floc'h}, E. and C. Papovich and D. Rigopoulou and L. Bai and Engelbracht, {C. W.} and D. Frayer and Gordon, {K. D.} and Hines, {D. C.} and Misselt, {K. A.} and S. Miyazaki and Morrison, {J. E.} and Rieke, {G. H.} and Rieke, {M. J.} and J. Surace",

year = "2004",

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doi = "10.1086/422716",

language = "English (US)",

volume = "154",

pages = "107--111",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

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number = "1",

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TY - JOUR

T1 - Extremely red objects in the Lockman hole

AU - Wilson, G.

AU - Huang, J. S.

AU - Pérez-González, P. G.

AU - Egami, E.

AU - Ivison, R. J.

AU - Rigby, J. R.

AU - Alonso-Herrero, A.

AU - Barmby, P.

AU - Dole, H.

AU - Fazio, G. G.

AU - Le Floc'h, E.

AU - Papovich, C.

AU - Rigopoulou, D.

AU - Bai, L.

AU - Engelbracht, C. W.

AU - Frayer, D.

AU - Gordon, K. D.

AU - Hines, D. C.

AU - Misselt, K. A.

AU - Miyazaki, S.

AU - Morrison, J. E.

AU - Rieke, G. H.

AU - Rieke, M. J.

AU - Surace, J.

PY - 2004/9

Y1 - 2004/9

N2 - 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.

AB - 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.

KW - Cosmology: Observations

KW - Galaxies: Evolution

KW - Galaxies: High-redshift

KW - Galaxies: Photometry

KW - Galaxies: Starburst

KW - Infrared: Galaxies

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U2 - 10.1086/422716

DO - 10.1086/422716

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SN - 0067-0049

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SP - 107

EP - 111

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

IS - 1

ER -

Extremely red objects in the Lockman hole

Abstract

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