Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2012-01-17
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Talk at the conference "The Extreme and Variable High Energy Sky", September 19-23, 2011, Chia Laguna, Sardegna (Italy). 6 pag
Scientific paper
Hard X-ray surveys like those provided by IBIS and BAT on board the INTEGRAL and Swift satellites list a significant number of sources which are unidentified and/or unclassified and which deserve multiwaveband observations to be properly characterized. In this work we have been able to follow up 148 such sources, finding 27 X-ray binaries and 121 Active Galactic Nuclei (AGN). From the AGN sample we extracted a set of 94 AGN, belonging to the INTEGRAL/IBIS and Swift/BAT surveys, for which we performed an X-ray study to determine absorption and 2-10 keV flux by means of XMM-Newton and Swift/XRT available observations. Using a new diagnostic diagram we identified a few peculiar sources which apparently do not fit within the AGN unified theory. Finally, we have compared the optical versus X-ray properties of these 94 AGN to study the optical reddening versus the X-ray absorption local to the AGN
Parisi Pietro
Survey Team for the IBIS
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