Issue |
A&A
Volume 443, Number 3, December I 2005
|
|
---|---|---|
Page(s) | 831 - 839 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20042208 | |
Published online | 15 November 2005 |
Surface density of extremely red objects with R - J ≥ 5
1
Geneva Observatory, 51 Ch. des Maillettes, Sauverny 1290, Switzerland e-mail: Angela.Hempel@obs.unige.ch
2
Max Planck Institute for Astronomy (MPIA), Königstuhl 17, 69117 Heidelberg, Germany e-mail: herbst@mpia.de
3
The Palomar Observatory, California Institute of Technology, Pasadena, CA 91125, USA e-mail: djt@irastro.caltech.edu
Received:
19
October
2004
Accepted:
5
April
2005
We present the results of a wide-field survey for extremely red objects
(EROs), based on J and R band imaging. The survey covers 2.89 deg2,
consisting of 50 single fields, each approximately 210 arcmin2 in size. This
survey provides a sample of 60 extended objects with a colour of
and J band magnitudes more than 10σ above background (
).
Thirty five of these objects have been detected in both J and R-band.
We derive a surface density
for such EROs of
arcmin-2, which is about seven times lower than for galaxies with
.
Stellar population models suggest that these EROs are massive
galaxies with an old stellar population in a redshift range of
.
For this scenario, we estimate the co-moving volume density to be
(
Mpc-3.
Key words: Galaxy: evolution / galaxies: high-redshift / galaxies: elliptical and lenticular, cD
© ESO, 2005
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