Recent developments in the search for Compton-thick AGN

Details Recent developments in the search for Compton-thick AGN Recent developments in the search for Compton-thick AGN

2012-04-10

arxiv.org/abs/1204.2173v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

to appear in 'International Journal of Modern Physics D', Invited talk in the Third Galileo - Xu Guangqi meeting, Beijing, Chi

Scientific paper

I present a review of X-ray and mid-IR surveys for Compton-thick Active Galactic Nuclei (AGN). These are the most highly obscured sources having hydrogen column densities >1.5x10^24 cm-2. Key surveys in the local Universe are presented including the high energy SWIFT/BAT and INTEGRAL surveys, mid-IR and also optical surveys. Recently, deep X-ray surveys with Chandra and XMM-Newton have produced a number of candidate Compton-thick AGN at higher redshift primarily in the Chandra Deep Field South region. In addition, mid-IR surveys with Spitzer have helped to develop novel complementary techniques for the selection of Compton-thick AGN. The mid-IR techniques used to identify Compton-thick AGN include: a) 24 micron excess sources relative to their optical emission b) Spitzer spectroscopy for the detection of high optical depth Si 9.7 micron absorption features c) low X-ray to 6 micron luminosity ratio.

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