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Title: Extremely red objects in the UKIDSS Uultra Deep Survey Early Data Release
Authors: Simpson, C.
Almaini, O.
Cirasuolo, M.
Dunlop, J.
Foucaud, S.
Hirst, P.
Ivison, R.
Page, M.
Rawlings, S.
Sekiguchi, K.
Smail, I.
Watson, Michael G.
First Published: 27-Sep-2006
Publisher: Blackwell Publishing on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society: Letters, 2006, 373 (1), pp. L21-L25
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 arcmin2 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 active galactic nuclei are more prevalent among the passive ERO population.
DOI Link: 10.1111/j.1745-3933.2006.00235.x
ISSN: 1745-3933
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2006 The Authors. Journal compilation © 2006 RAS. Deposited with reference to the publisher's archiving policy available from the Journal Exclusive Licence Form, which permits posting of the Blackwell Publishing PDF 6 months after publication. The definitive version is available from
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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