Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840804j&link_type=abstract
American Astronomical Society, AAS Meeting #218, #408.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We have constructed a sample of 51 unobscured Seyferts selected from a cross-correlation between the 2XMMi catalog and SDSS DR7, which included 12 Narrow Line Seyfert 1s (NLS1s). Plus in some cases we have aperture photometry from the XMM Optical Monitor. We use these data to produce Spectral Energy Distributions (SEDs), from 10keV to just shortward of 1 micron.
Using a new self-consistent multi-component model comprising a disc , a Comptonised and a power-law component, we derive best-fit models to the SEDs. From these we are better able to quantify the intrinsic properties of the AGN.
In particular, we find substantial spectral diversity among the sample. The characteristics of the continuum shape depends on parameters such as the profile of permitted emission lines, black hole mass and Eddington ratio, the latter being the most influential single indicator of the overall SED. The distribution of the spectral parameters confirms that NLS1s in general have softer 2-10 keV X-ray spectra, lower 2-10 keV luminosities, lower black hole masses, and higher Eddington ratios. We also correlated distinct Balmer line components ie. broad, intermediate and narrow, with the different SED components. We find that emission associated with the broad line region correlates best with the hard X-ray component, suggesting a close link between high velocity gas and central emission. Interestingly this correlation is better than that using the accretion disc component, where most of the ionising photons emerge. Unless the correlations are dominated by modelling uncertainties, this suggests that geometry of the SED components could be important.
We find that the 2-10 keV luminosity strongly correlates with the underlying optical continuum redward of 5000A, possibly due to the presence of an extra component associated with the AGN (a stellar origin is unlikely based on other observations), but not from a standard accretion disc component.
Done Christine
Gelbord Jonathan
Jin Chichuan
Ward Martin J.
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