Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9894l&link_type=abstract
HST Proposal ID #9894
Physics
Hst Proposal Id #9894 Agn/Quasars
Scientific paper
Narrow-line Seyfert 1 galaxies {NLS1s} have remarkably different properties than Active Galactic Nuclei with broad optical lines. The most promising explanation for this behavior is that NLS1s have a higher accretion rate relative to Eddington {L/M} than do broad-line Seyferts. Despite uniformity in optical line properties, detailed analysis reveals a divergence of the UV emission line properties that can be traced differences in the shape of the continuum. A link with similarly divergent X-ray properties suggests that there may be variations in L/M even among NLS1s. To test this scenario, we propose UV spectroscopic of two X-ray extreme NLS1s. These observations offer the opportunity to advance our understanding in the scatter in the relationship between line width and black hole mass, to understand physics of gas in AGN optical and UV emission-line regions, and to understand recently-discovered peculiar line-less high-z quasars that may be the early universe counterpart of luminous NLS1s.
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