Deep Spitzer observations of infrared-faint radio sources: high-redshift radio-loud AGN?

Abstract

Infrared-faint radio sources (IFRSs) are a rare class of object 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 (SERVS). Nearly all the IFRSs are undetected at a level of ~ 1 μ$Jyinthesenewdeepobservations,andeventhedetectionsareconsistentwithconfusionwithunrelatedgalaxies.Astackedimageimpliesthatthemedianfluxdensityis$S_{3.6μm} ~ 0.2$\mu$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.

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