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

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

2011-05-04

arxiv.org/abs/1105.0960v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Scientific paper

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 \mu$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 $S_{3.6\mu m} ~ 0.2$ \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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