Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8605b&link_type=abstract
HST Proposal ID #8605
Computer Science
Hst Proposal Id #8605 Agn/Quasars
Scientific paper
The broad emission line regions of 20 AGN have been successfully reverberation mapped in intensive international monitoring campaigns, allowing model dependent determinations of the central mass. This determination depends on the hypothesis that the dynamics in this gas are dominated by gravity, consistent with the detection of the expected Keplerian decline in velocity with radius in the best studied case {NGC5548}. However, when normalized by the bulge mass of the host galaxy, the central masses in these 20 AGN are over an order of magnitude less massive than the compact dark masses found in normal galaxies. If the masses determined by reverberation mapping can be independently verified, this technique could potentially be used to measure the evolution in the masses of the population of supermassive black holes over cosmic time and determine these masses in radio-quiet and radio-loud AGN spanning a huge range in luminosity. We therefore propose to use STIS to measure the stellar dynamics in the type 1 Seyfert nucleus in NGC3227, in which the measurements will be the most straightforward by far. If the reverberation mapped mass is correct, we will see its dynamical signature in these new data.
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