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Deep spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei?


Norris, RP and Afonso, J and Cava, A and Farrah, D and Huynh, MT and Ivison, RJ and Jarvis, M and Lacy, M and Mao, M and Maraston, C and Mauduit, J-C and Middelberg, E and Oliver, S and Seymour, N and Surace, J, Deep spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei?, The Astrophysical Journal: An International Review of Astronomy and Astronomical Physics, 736, (1) EJ ISSN 0004-637X (2011) [Refereed Article]

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Copyright Statement

Copyright 2011 American Astronomical Society

DOI: doi:10.1088/0004-637X/736/1/55


Infrared-faint radio sources (IFRSs) are a rare class of objects which are relatively bright at radio wavelengths but very faint at infrared and optical wavelengths. Here we present sensitive near-infrared observations of a sample of these sources taken as part of the Spitzer Extragalactic Representative Volume Survey. Nearly all the IFRSs are undetected at a level of ~1 Jy in these new deep observations, and even the detections are consistent with confusion with unrelated galaxies. A stacked image implies that the median flux density is S3.6 m ~ 0.2 Jy or less, giving extreme values of the radio-infrared flux density ratio. Comparison of these objects with known classes of object suggests that the majority are probably high-redshift radio-loud galaxies, possibly suffering from significant dust extinction.

Item Details

Item Type:Refereed Article
Keywords:galaxies: evolution; galaxies: formation; galaxies: starburst
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Mao, M (Miss Minnie Mao)
ID Code:75140
Year Published:2011
Web of Science® Times Cited:29
Deposited By:Mathematics and Physics
Deposited On:2012-01-12
Last Modified:2012-04-23

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