Published in

Oxford University Press, Monthly Notices of the Royal Astronomical Society, 4(337), p. 1282-1298, 2002

DOI: 10.1046/j.1365-8711.2002.05975.x

Links

Tools

Export citation

Search in Google Scholar

The clustering, number counts and morphology of extremely red (R-K > 5) galaxies to K

Journal article published in 2002 by N. D. Roche, O. Almaini ORCID, J. Dunlop, R. J. Ivison, C. J. Willott
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Green circle
Postprint: archiving allowed
Upload
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

We investigate the number counts, clustering, morphology and radio/X-ray emission of extremely red objects (EROs), defined as galaxies with R-K>5.0. This criterion will select old, passive ellipticals at z>0.9. To K=21 we identify a total of 166 EROs in 81.5 sq. arcmin. The ERO number counts are lower than predicted by a pure luminosity evolution model, but higher than predicted by current CDM-based hierarchical models. They can be fitted by a combination of moderate merging with a decrease with redshift in the comoving number density of passive galaxies. We investigate the angular correlation function and find that the EROs have a much higher correlation amplitude than full K-limited samples of galaxies. This implies that the intrinsic clustering of EROs is stronger than that of present-day E/S0 galaxies. We estimate the comoving correlation radius as 12-20 Mpc. We estimate seeing-corrected angular sizes and morphological types for a K