The Surface Density of Extremely Red Objects

D. Thompson; S. V.W. Beckwith; R. Fockenbrock; J. Fried; H. Hippelein; J. S. Huang; B. Von Kuhlmann; Ch Leinert; K. Meisenheimer; S. Phleps; H. J. Röser; E. Thommes; C. Wolf

doi:10.1086/307708

The Surface Density of Extremely Red Objects

D. Thompson^*, S. V.W. Beckwith, R. Fockenbrock, J. Fried, H. Hippelein, J. S. Huang, B. Von Kuhlmann, Ch Leinert, K. Meisenheimer, S. Phleps, H. J. Röser, E. Thommes, C. Wolf

^*Corresponding author for this work

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

91 Citations (Scopus)

Abstract

We present initial results from a field survey for extremely red objects [EROs, defined here as (R - K′) ≥ 6 mag] covering 154 arcmin² of sky, from the first of seven deep, wide-field K′ images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5 σ point source detection limits are K′ = 20.5 mag and R = 25.0 mag, while extended-source limits are up to 0.50-0.75 mag brighter. We identify a total of eight bright EROs with K′ ≤ 19.0 mag. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining two are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the six bright, extragalactic EROs of 0.039±0.016 arcmin^-2, which is higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.

Original language	English
Pages (from-to)	100-106
Number of pages	7
Journal	Astrophysical Journal
Volume	523
Issue number	1
DOIs	https://doi.org/10.1086/307708
Publication status	Published - 20 Sept 1999
Externally published	Yes

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@article{1827a38abc0241d79541c7b1e545ca0a,

title = "The Surface Density of Extremely Red Objects",

abstract = "We present initial results from a field survey for extremely red objects [EROs, defined here as (R - K′) ≥ 6 mag] covering 154 arcmin2 of sky, from the first of seven deep, wide-field K′ images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5 σ point source detection limits are K′ = 20.5 mag and R = 25.0 mag, while extended-source limits are up to 0.50-0.75 mag brighter. We identify a total of eight bright EROs with K′ ≤ 19.0 mag. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining two are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the six bright, extragalactic EROs of 0.039±0.016 arcmin-2, which is higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.",

keywords = "Galaxies: photometry, Galaxies: statistics, Infrared: galaxies, Surveys",

author = "D. Thompson and Beckwith, \{S. V.W.\} and R. Fockenbrock and J. Fried and H. Hippelein and Huang, \{J. S.\} and \{Von Kuhlmann\}, B. and Ch Leinert and K. Meisenheimer and S. Phleps and R{\"o}ser, \{H. J.\} and E. Thommes and C. Wolf",

note = "{\textcopyright} 1999 The Author(s)",

year = "1999",

month = sep,

day = "20",

doi = "10.1086/307708",

language = "English",

volume = "523",

pages = "100--106",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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TY - JOUR

T1 - The Surface Density of Extremely Red Objects

AU - Thompson, D.

AU - Beckwith, S. V.W.

AU - Fockenbrock, R.

AU - Fried, J.

AU - Hippelein, H.

AU - Huang, J. S.

AU - Von Kuhlmann, B.

AU - Leinert, Ch

AU - Meisenheimer, K.

AU - Phleps, S.

AU - Röser, H. J.

AU - Thommes, E.

AU - Wolf, C.

PY - 1999/9/20

Y1 - 1999/9/20

N2 - We present initial results from a field survey for extremely red objects [EROs, defined here as (R - K′) ≥ 6 mag] covering 154 arcmin2 of sky, from the first of seven deep, wide-field K′ images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5 σ point source detection limits are K′ = 20.5 mag and R = 25.0 mag, while extended-source limits are up to 0.50-0.75 mag brighter. We identify a total of eight bright EROs with K′ ≤ 19.0 mag. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining two are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the six bright, extragalactic EROs of 0.039±0.016 arcmin-2, which is higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.

AB - We present initial results from a field survey for extremely red objects [EROs, defined here as (R - K′) ≥ 6 mag] covering 154 arcmin2 of sky, from the first of seven deep, wide-field K′ images obtained as part of the Calar Alto Deep Imaging Survey (CADIS). The 5 σ point source detection limits are K′ = 20.5 mag and R = 25.0 mag, while extended-source limits are up to 0.50-0.75 mag brighter. We identify a total of eight bright EROs with K′ ≤ 19.0 mag. Six of these bright EROs are resolved and are likely to be galaxies, while the remaining two are unresolved, with colors consistent with their being low-mass galactic stars. We derive a surface density for the six bright, extragalactic EROs of 0.039±0.016 arcmin-2, which is higher by a factor of 4 than previous values. We estimate that the volume density of bright EROs to be as high as that of nearby Seyfert galaxies.

KW - Galaxies: photometry

KW - Galaxies: statistics

KW - Infrared: galaxies

KW - Surveys

UR - https://www.scopus.com/pages/publications/0033588645

U2 - 10.1086/307708

DO - 10.1086/307708

M3 - Article

SN - 0004-637X

VL - 523

SP - 100

EP - 106

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

The Surface Density of Extremely Red Objects

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