Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-10-18
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
SF2A 2011 conference proceedings
Scientific paper
To optimally identify candidates of the Compton-thick (CT) active galactic nuclei (AGN) that contribute to the unresolved X-ray background in infrared surveys, a tracer of column density is desirable in addition to an AGN indicator. In a recent study, we aimed to test whether the 9.7 micron silicate absorption feature can be used for this purpose when seen at high optical depths. We found that the extreme criterion of optical thickness at 9.7 micron is efficient in identifying CT objects among local AGN. Having identified six of the nine CT AGN in the 12 micron sample with Spitzer and X-ray spectra, we expanded this analysis at intermediate/high z, using all GOODS and FLS sources with Spitzer and X-ray observations. We found 12 sources with tau_9.7>1 that host an AGN between 0.8
Dasyra Kalliopi M.
Georgantopoulos Ioannis
Pope Adrian
Rovilos Manolis
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