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- W4301910326 abstract "We explore the nature of the radio emission of X-ray selected AGN by combining deep radio (1.4 GHz; 60 μJy) and X-ray data with multiwavelength (optical, mid-infrared) observations in the Extended Chandra Deep Field South (E-CDFS). The fraction of radio detected X-ray sources increases from 9% in the E-CDFS to 14% in the central region of this field, which has deeper X-ray coverage from the 1 Ms CDFS. We find evidence that the radio emission of up to 60% of the hard X-ray/radio matched AGN is likely associated with star-formation in the host galaxy. Firstly, the mid-IR (24 μm) properties of these sources are consistent with the infrared/radio correlation of starbursts. Secondly, most of them are found in galaxies with blue rest-frame optical colours (), suggesting a young stellar population. On the contrary, X-ray/radio matched AGN which are not detected in the mid-infrared have red colours suggesting their radio emission is associated with AGN activity. We also find no evidence for a population of heavily obscured radio-selected AGN that are not detected in X-rays. Finally, we do no confirm previous claims for a correlation between radio emission and X-ray obscuration. Assuming that the radio continuum measures star-formation, this finding is against models where the dust and gas clouds associated with circumnuclear starbursts are spherically blocking our view to the central engine." @default.
- W4301910326 created "2022-10-06" @default.
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- W4301910326 date "2007-02-20" @default.
- W4301910326 modified "2023-10-16" @default.
- W4301910326 title "Radio observations of the Chandra Deep Field South" @default.
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- W4301910326 doi "https://doi.org/10.1051/0004-6361:20066995" @default.
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