Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840911p&link_type=abstract
American Astronomical Society, AAS Meeting #218, #409.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Narrow Line Seyfert 1 galaxies are among the most interesting class of active nuclei. Their observational properties suggest that they are high accretion rate systems probably associated with relatively small back hole masses with compared to classical Seyfert 1 galaxies. However, the number of known NLSy1 detected above 10 keV is small notwithstanding the importance of the high energy data to discriminate between the major compelling models. Here we present a detailed study of a sample of 14 NLSy1 detected above 10 keV by INTEGRAL/IBIS, through an accurate broad-band analysis using INTEGRAL data combined with XMM-Newton, Suzaku and Swift. Their high energy spectral properties have been related to their accretion parameters in order to unveil the nature of these extreme AGN. We have estimated the fraction of NLSy1 in the hard X-ray sky to be nearly 15%, in agreement with the estimate derived from optically selected NLSy1 samples. We confirm the association of NLSy1 with small black hole masses, however hard X-ray NLSy1 seem to occupy the lower tail of the Eddington ratios distribution of classical NLSy1.
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