Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2001m&link_type=abstract
American Astronomical Society, AAS Meeting #212, #20.01; Bulletin of the American Astronomical Society, Vol. 40, p.216
Other
Scientific paper
Narrow-line Seyfert 1 galaxies (NLS1s) are known to have properties that distinguish them from broad-line Seyferts. They are identified by their narrow optical permitted lines including Hβ, weak forbidden lines including [OIII], and strong FeII. They also have unusual UV emission-line properties including strong low-ionization lines such as SiII and blueshifted high-ionization lines such as CIV. Their X-ray properties are distinctive: they have steep X-ray spectra, strong soft excesses, and frequently show high-amplitude variability. These distinctive properties are usually attributed to a high accretion rate relative to Eddington compared with other AGN.
However, the properties of objects classified as NLS1s are not uniform. Some have higher amplitude variability than others, and that property is associated with the strength of the soft excess. Some objects have very blueshifted high-ionization lines, and some do not, and the blueshift has been shown to be related to αox, a parameter that measures the relative strength of the UV and X-ray emission. This dispersion could indicate a range of accretion rates among NLS1s themselves, or something else.
We analyzed a sample of 21 objects that have both XMM-Newton observations and HST spectra in order to determine whether the central engine characteristics, defined by the X-ray properties, are related to the broad-line region characteristics, defined by the UV emission-line properties. In this poster, we present analysis of the XMM-Newton spectra. We find that a broken power law model can adequately parameterize all the spectra in the 0.3-6 keV band. The soft excess has recently been modeled using a relativistically blurred reflection model and a relativistically smeared ionized absorption model. We compare the broken power law parameterization and the two physical models using simulated spectra and compare with our results.
Leighly Karen M.
Maddumage H.
McCully Curtis
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