Year: 1999
Type: article
Abstract: We present initial results from a field survey for extremely red objects [EROs, defined here as ( R - K ') ≥ 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 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.
Source: The Astrophysical Journal
DOI: 10.1086/307708
Authors: 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. Roser, E. Thommes, C. Wolf
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2061919516