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dc.contributor.authorNorris, R.
dc.contributor.authorAfonso, J.
dc.contributor.authorCava, A.
dc.contributor.authorFarrah, D.
dc.contributor.authorHuynh, M.
dc.contributor.authorIvison, R.
dc.contributor.authorJarvis, M.
dc.contributor.authorLacy, M.
dc.contributor.authorMao, M.
dc.contributor.authorMaraston, C.
dc.contributor.authorMauduit, J.
dc.contributor.authorMiddelberg, E.
dc.contributor.authorOliver, S.
dc.contributor.authorSeymour, Nick
dc.contributor.authorSurace, J.
dc.identifier.citationNorris, R. and Afonso, J. and Cava, A. and Farrah, D. and Huynh, M. and Ivison, R. and Jarvis, M. et al. 2011. Deep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei? Astrophysical Journal. 736 (1).

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.

dc.titleDeep Spitzer observations of infrared-faint radio sources: High-redshift radio-loud active galactic nuclei?
dc.typeJournal Article
dcterms.source.titleAstrophysical Journal
curtin.departmentDepartment of Physics and Astronomy
curtin.accessStatusOpen access via publisher

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