Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21811501b&link_type=abstract
American Astronomical Society, AAS Meeting #218, #115.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the sample of AGN detected by INTEGRAL /IBIS in the 20-100 keV band and reported in most recent surveys. The sample contains 268 objects of which 127 are of type 1, 115 are of type 2 and 23 are Blazars ; it also includes some peculiar class of AGN detected at high energies for the first time such as few XBONG, a number of Liners and a small set of type 2 QSO. The absorption properties of the sample are discussed including an update on the fraction of Compton thick objects. For a sub-sample of 87 sources, which represent a complete set of bright AGN , we study the hard X-ray (20-100keV) spectral properties also in comparison with SWIFT/BAT 58 months data; we give information on spectral and flux variability , average spectral shape and BAT/IBIS cross calibration constant. For this complete sample we also present broad band data for Sey1 and Sey2 separately. In particular, for Sey1 we define the parameter space of photon index versus cut-off energy assuming fixed values of the reflection: this exercise provides strong constraints on both parameters which can be used as key inputs for modelling of AGN and for estimating their contribution to the cosmic background radiation. For Sey2 instead, broad band study shows strong evidence that a single uniform absorbing medium does not account for the observed spectra. In particular the Compton reflection components we measure, reflection continuum and iron line(s), are not immediately compatible with a scenario in which the absorbing and reflecting media are one and the same, i.e. the obscuring torus. We also present for the first time the broad band (01.-100 keV) properties of a sample of 14 hard X-ray selected narrow Line Sey1 and their relation to the accretion parameters. An update on our optical and radio follow up work will also be presented as well as an insight into the cross correlation analysis with gamma-ray catalogues. Future prospects will finally be outlined.
No associations
LandOfFree
INTEGRAL /IBIS Survey of AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with INTEGRAL /IBIS Survey of AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and INTEGRAL /IBIS Survey of AGN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1736791