Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4410m&link_type=abstract
American Astronomical Society, AAS Meeting #211, #44.10; Bulletin of the American Astronomical Society, Vol. 39, p.793
Other
1
Scientific paper
Based on our new optical spectroscopic sample, we examine the kinematic properties of various emission line regions in narrow line Seyfert 1s (NLS1s), by modelling their profiles using multiple component fits. We interpret these results by comparison with equivalent components measured in the spectra of some broad line Seyfert 1s and a typical Seyfert 2 galaxy. We find that the Ha and Hb line profiles cannot be modelled using the traditional two gaussians typical for broad line Seyferts. We investigate the merits of Lorentzian-plus-gaussian and three-gaussian fits to these lines, and find that the latter provides a statistically better fit requiring the presence of a broad (>3000km/s, FWHM) component. This may correspond to a suppressed broad line region in NLS1s with similar kinematics to those of typical broad line Seyfert 1s.
From the profiles of the forbidden high ionisation lines in NLS1s, we find that they appear to trace an 'intermediate' velocity region with kinematics between the standard broad and narrow line regions. Additional evidence of this region is present in the profiles of the permitted Balmer lines. Finally, we note that despite having quite similar ionisation potentials, the relative intensities of the highly ionised lines of [Fe X]6374 and [FeXI]7892, display considerable dispersion from one galaxy to another. The interpretation of this requires further modeling, but suggests the possibility of using the ratio as a diagnostic to constrain the shape of the spectral energy distribution in the vicinity of 100eV. A region which cannot be directly observed, but which may contribute significantly to the bolometric luminosity. Based on work funded by an STSCI PhD grant.
Mullaney James
Ward Martin
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