Kinematics of Gaseous Disks in the Nuclei of Liners with Compact Flat Spectrum Radio Sources

Details Kinematics of Gaseous Disks in the Nuclei of Liners with Compact Flat Spectrum Radio Sources Kinematics of Gaseous Disks in the Nuclei of Liners with Compact Flat Spectrum Radio Sources

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7354d&link_type=abstract

HST Proposal ID #7354

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Hst Proposal Id #7354 Agn/Quasars

Scientific paper

Many active galactic nuclei channel energetic particles into jets that feed powerful extended lobes of radio emission; others remain quite compact. Both classes of active galaxies are suspected to be powered gravitationally by the accretion of surrounding material onto a massive black hole. Convincing evidence of this has been found with HST for the prototype of the jet-producing galaxies, M87, in the form of a bright nuclear gaseous disk in rapid Keplerian rotation, whose motion indicates a central mass ~ 2x10^9 Msun. Using WFPC2, we have found similar arcsec-scale gaseous disks in 12 compact AGN without jets. We now propose to use STIS+G750M to make long- slit spectral observations of the emission line gas in these bright Liners with powerful compact flat-spectrum radio sources. We will take advantage of the spatial resolution to isolate and examine the broad HAlpha components, already known to exist. We will model the velocity distributions to see if rotation is basically Keplerian, to see if there are departures from simple rotation, and to determine or set limits on the masses of black holes and distributed mass. Finally, we will study the emission-line regions of these galaxies in combination with high resolution radio images made with the VLBA, to learn about the evolution and interaction of the hot gas and the relativistic plasma, and to try to determine why these AGN seem unable to produce jets.

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