Extremely red objects in the UKIDSS Ultra Deep Survey Early Data Release
Abstract
We construct a sample of extremely red objects (EROs) within the UKIDSS Ultra Deep Survey by combining the Early Data Release with optical data from the Subaru/XMM-Newton Deep Field. We find a total of 3715 objects over 2013 sq. arcmin with R-K>5.3 and K<=20.3, which is a higher surface density than found by previous studies. This is partly due to our ability to use a small aperture in which to measure colours, but is also the result of a genuine overdensity of objects compared to other fields. We separate our sample into passively-evolving and dusty star-forming galaxies using their RJK colours and investigate their radio properties using a deep radio map. The dusty population has a higher fraction of individually-detected radio sources and a higher mean radio flux density among the undetected objects, but the passive population has a higher fraction of bright radio sources, suggesting that AGNs are more prevalent among the passive ERO population.
Cite
@article{arxiv.astro-ph/0608428,
title = {Extremely red objects in the UKIDSS Ultra Deep Survey Early Data Release},
author = {Chris Simpson and Omar Almaini and Michele Cirasuolo and Jim Dunlop and Sebastien Foucaud and Paul Hirst and Rob Ivison and Mat Page and Steve Rawlings and Kaz Sekiguchi and Ian Smail and Mike Watson},
journal= {arXiv preprint arXiv:astro-ph/0608428},
year = {2009}
}
Comments
Accepted for publication in MNRAS Letters