Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10193n&link_type=abstract
HST Proposal ID #10193
Physics
Hst Proposal Id #10193 Agn/Quasars
Scientific paper
We propose to obtain long-slit optical spectra of three nearby quasars with the largest reported narrow-line regions {NLRs}. These sources have been shown to be the cornerstone of a most interesting size-luminosity relationship in AGN-NLRs which, we suspect, is very problematic. A two-orbit HST/STIS observation, per source, will allow us to measure several narrow emission lines from H_beta through H_alpha and [S II] at several distances along the spatial direction. We will thus be able to classify the line excitation mechanism, estimate the gas density as a function of distance from the center, and more properly define the 'NLR size'. This will allow us to test the idea that the NLR conditions in these quasars are very different from those observed in low luminosity AGN and, specifically, that some of the narrow emission lines have a star forming origin. Together with our IR spectra of high-redshift quasars, we will be able to test the newly discovered NLR size-luminosity relationship in AGN and the AGN-starburst connection at the high luminosity end.
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