The surface density of extremely red objects

被引：109

作者：

Thompson, D ^{[1
]}

Beckwith, SVW ^{[1
]}

Fockenbrock, R ^{[1
]}

Fried, J ^{[1
]}

Hippelein, H ^{[1
]}

Huang, JS ^{[1
]}

von Kuhlmann, B ^{[1
]}

Leinert, C ^{[1
]}

Meisenheimer, K ^{[1
]}

Phleps, S ^{[1
]}

Röser, HJ ^{[1
]}

Thommes, E ^{[1
]}

Wolf, C ^{[1
]}

机构：

[1] Max Planck Inst Astron, D-69117 Heidelberg, Germany

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 523卷 / 01期

关键词：

galaxies : photometry; galaxies : statistics; infrared : galaxies; surveys;

D O I：

10.1086/307708

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present initial results from a field survey for extremely red objects [EROs, defined here as (R-K') greater than or equal to 6 mag] covering 154 arcmin(2) 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 sigma 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' less than or equal to 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.

引用

页码：100 / 106

页数：7

共 34 条

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[Anonymous], JCMT UKIRT NEWSLETTE

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