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SUMMARY:Heavily Obscured AGN\, a radio vs X-ray challenge - Giovanni Mazzo
 lari
DTSTART:20231129T131500Z
DTEND:20231129T134000Z
UID:TALK209104@talks.cam.ac.uk
CONTACT:107642
DESCRIPTION:Heavily obscured AGN represent a fundamental phase in the MBH-
 galaxy coevolution scenario. They are expected to constitute a major fract
 ion of the whole AGN population\, in particular at high-z\, but their stat
 istics and evolution across cosmic time are still highly uncertain. A prom
 ising way to select most obscured AGN is through radio emission\, which is
  largely unaffected by obscuration and can be used as a proxy for nuclear 
 activity. \nIn this talk\, I will present a detailed investigation of the 
 effectiveness of radio selection to discover heavily obscured AGN\, I will
  compare their radio and X-ray detectability\, and present predictions for
  current and future radio surveys.\nOur results show that\, while X-ray se
 lection is generally more effective in detecting unobscured AGN\, radio se
 lection is significantly more effective in detecting the most heavily obsc
 ured\, Compton-thick AGN. Thousands of Compton-thick nuclei are indeed exp
 ected to hide among the sources of popular radio catalogs\, escaping any d
 etection in the corresponding X-ray observations.\nI will finally present 
 expectations for the number of AGN to be detected by the continuum surveys
  of the Square Kilometer Array Observatory (SKAO). SKAO is expected to det
 ect more than 2000 AGN at z>6\, and even some tens at z>10: half of them C
 ompton-thick.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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