Bibcode
Streblyanska, A.; Hasinger, G.; Finoguenov, A.; Barcons, X.; Mateos, S.; Fabian, A. C.
Bibliographical reference
Astronomy and Astrophysics, Volume 432, Issue 2, March III 2005, pp.395-400
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3
2005
Journal
Citations
64
Refereed citations
47
Description
Using the 770 ks XMM-Newton survey of the Lockman Hole field in
combination with extensive optical identifications of the AGN
population, we derive an average rest-frame spectrum of AGN types-1 and
2. The most prominent feature in the averaged spectrum is a strong
fluorescent Fe line. In both type-1 and type-2 AGN, a clear relativistic
line profile is revealed. A laor line profile with an inner disk radius
smaller than the last stable orbit of a Schwarzschild black hole is most
consistent with the data, indicating that the average supermassive black
hole has significant spin. Equivalent widths of the broad relativistic
lines range between 400-600 eV. We used the disk reflection model to
compare the observed strength of the line with the amplitude of the
reflection component, concluding that to consistently describe the
observations the average iron abundance should be about three times the
solar value.
Based on observations obtained with XMM-Newton, an ESA science mission
with instruments and contributions directly funded by ESA Member States
and the USA (NASA).