Xray Properties of variability selected Active Galactic Nuclei in the Chandra Deep Field South CDFS

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X-ray Properties of variability selected Active
Galactic Nucleiin the Chandra Deep Field South
(CDF-S)K.Boutsia, D.Trevese, E.Cappellaro, F.
FioreUniversity of Rome La Sapienza / ESO

• This method selects point like objects as well as
  extended objects
• 21 out of 34 candidates (62) show X-ray
  emission and are most likely to be QSOs
• 17 out of 18 candidates (94) that have both
  X-ray emission and optical spectra are confirmed
  to be AGN.
• 71 of the QSOs in the COMBO-17 catalog, that are
  found in the CDFS area, show variability.

R.M.S. variation vs. V band magnitude.
We have obtained 5 nights of observations with
EMMI on the NTT telescope (La Silla, Chile) for
the spectroscopic follow-up of part of our
candidates.