X-ray spectral constraints for z~2 massive galaxies : the identification of reflection-dominated active galactic nuclei. Authors:Alexander reporter:王文侠. Outline. Introduction Data and stacking procedures Analyses and results Summary. Introduction.
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• Employ X-ray stacking analyses of X-ray undetected IR galaxies
• X-ray stacking analyses need to be treated with caution
• Extend the analyses of Daddi et al.
76 objects classified as IR-excess and 146 objects classified as IR-normal galaxies
47 BzK galaxies have an X-ray counterpart,28 of which are classified as IR-excess galaxies and 19 of which are classified as IR-normal galaxies
11 of the 47 X-ray detected BzK galaxies are classified as "heavily obscured AGNs"
9 of these objects are classified as "luminous AGNs",the other 27 objects are classified as "low-luminosity X-ray systems"