Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agn8.confe..37l&link_type=abstract
Proceedings of the 8th National Conference on AGN, held in Torino, Italy, May 19-22, 2008. Edited by L. Lanteri, C.M. Raiteri,
Other
Scientific paper
Several surveys in the Selected Area 57 were conducted since the 80's, to search for AGNs with various techniques including colours, variability and proper motions. Recently we have carried out a new survey with XMM-Newton (trevese et al. 2007), which yielded 140 X-ray sources, 98 of which were identified in existing optical catalogues. New optical spectroscopy was also obtained for some X-ray- or variability-selected candidates (Trevese et al. 2008). Here we present the X-ray spectral analysis of the sample. The distribution of X-ray colours is analysed, taking into account the optical classification. Spectral fitting with absorbed power law models indicate that 90 objects have a column density lower than log(NHI/cm^2)=22 while 17 are in the range 22 < 23 and 5 have log(NHI/cm^2)>23. Other 8 objects are fitted with thermal models.
Fiore Fabrizio
Lanzuisi Giorgio
Trevese Dario
Vagnetti Fausto
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