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SUMMARY:XZ: X-ray spectroscopic redshifts of obscured AGN - Charlotte Simm
 onds
DTSTART:20170814T103000Z
DTEND:20170814T113000Z
UID:TALK76161@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:Redshifts are fundamental for our understanding of extragalact
 ic X-ray sources. Ambiguous counterpart associations\, expensive optical s
 pectroscopy and/or multi-mission multiwavelength coverage to resolve degen
 eracies make estimation often difficult in practice. Here we present a new
  method to constrain redshifts from the full X-ray spectrum directly\, by 
 Bayesian model fitting of low-resolution spectra. We demonstrate our appro
 ach on real Chandra Deep Field South data\, determining 29 redshifts which
  have optical spectroscopic redshifts. Our accuracy is up to ∆z=0.5\, wi
 th only three outliers which can be explained by incorrect optical\nassoci
 ations. Through extensive simulations we verify the method. To work optima
 lly\, AGN need be obscured and have at least ∼200 (XMM-Newton) or ∼150
  (Chandra/ACIS) counts. Not meeting these conditions does not lead to wron
 g redshifts\, only large uncertainties. We conclude with predictions for t
 he upcoming eROSITA and ATHENA missions.
LOCATION:Ryle Large Meeting Room\, Kavli Building
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