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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei?
Astrophysical Journal, Volume 736, No. 1, Article 55, Year 2011
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Description
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 μJy 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 μm ∼ 0.2 μJy 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. © 2011. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Norris, Ray P.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Afonso, José M.
Portugal, Lisbon
Universidade de Lisboa
Cava, Antonio
Spain, Madrid
Universidad Complutense de Madrid
Farrah, Duncan G.
United Kingdom, Brighton
University of Sussex
Huynh, Minh T.
Unknown Affiliation
Ivison, Robert J.
United Kingdom, Edinburgh
Uk Astronomy Technology Centre
United Kingdom, Edinburgh
The University of Edinburgh
Jarvis, Matthew J.
United Kingdom, Hatfield
University of Hertfordshire
Lacy, Mark D.
United States, Charlottesville
National Radio Astronomy Observatory
Mao, Minnie Yuan
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Australia, Hobart
University of Tasmania
Australia, Eastwood
Anglo Australian Observatory
Maraston, Claudia
United Kingdom, Portsmouth
University of Portsmouth
Mauduit, Jean Christophe
Unknown Affiliation
Middelberg, Enno
Germany, Bochum
Ruhr-universitat Bochum
Oliver, Seb J.
United Kingdom, Brighton
University of Sussex
Seymour, Nick
United Kingdom, Dorking
Ucl Mullard Space Science Laboratory
Surace, Jason A.
Unknown Affiliation
Statistics
Citations: 30
Authors: 15
Affiliations: 13
Identifiers
Doi:
10.1088/0004-637X/736/1/55
ISSN:
0004637X
Study Design
Cross Sectional Study
Study Approach
Quantitative