Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.9006k&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #90.06; Bulletin of the American Astronomical Society, Vol. 30, p.1383
Astronomy and Astrophysics
Astronomy
Scientific paper
We compare the UV spectra of narrow-line Seyfert 1 (NLSy1) galaxies with the ``normal'' broad line AGN and show that the NLSy1s are characterized by narrower UV lines, weaker CIVlambda 1549, CIII]lambda 1909 emission and stronger SiIV+OIV]lambda 1400, SiIII]lambda 1892, AlIIIlambda 1857 emission. We show that such spectra are the result of BLR cloud densities that are larger than normal by factors 10-100, and with a lower ionization parameter. This is due to the steep soft X-ray spectra (which characterize the NLSy1 SEDs) which change the conditions in the two phase cloud-intercloud medium, resulting in higher BLR cloud densities and larger BLR radii. We also show that the steep soft and hard X-ray indices, observed in NLSy1s, can be explained by an accretion disk and corona model with large L/LEdd ratios. These UV properties add to the optical and X-ray properties known to be part of the Boroson & Green eigenvector 1. We propose that the L/LEdd is the physical parameter driving this eigenvector.
Czerny Bozena
Kuraszkiewicz Joanna
Mathur Savita
Wilkes Belinda J.
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