Surface density of extremely red objects with R - J ≥ 5

Details Surface density of extremely red objects with R - J ≥ 5 Surface density of extremely red objects with R - J ≥ 5

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...443..831h&link_type=abstract

Astronomy and Astrophysics, Volume 443, Issue 3, December I 2005, pp.831-839

Astronomy and Astrophysics

Astrophysics

Galaxy: Evolution, Galaxies: High-Redshift, Galaxies: Elliptical And Lenticular, Cd

Scientific paper

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 R-J ≥ 5 and J band magnitudes more than 10σ above background (18^mag≤ J ≤ 20^mag). Thirty five of these objects have been detected in both J and R-band. We derive a surface density for such EROs of 5.7±0.1×10-3 arcmin-2, which is about seven times lower than for galaxies with R-K≥6. Stellar population models suggest that these EROs are massive galaxies with an old stellar population in a redshift range of 1.4≤ z ≤ 3.0. For this scenario, we estimate the co-moving volume density to be (9.57 ± 1.24) ×10-6 Mpc-3.

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