Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7868q&link_type=abstract
HST Proposal ID #7868
Computer Science
Hst Proposal Id #7868 Agn And Quasars
Scientific paper
We propose to observe in the near-IR broad bands 2 nearby radio galaxies, NGC 4261 {3C 270} and M84 {NGC 4374, 3C 272.1}, that have gas disks and spectroscopic evidence for 10^9 M_odot black holes. In these galaxies the gas disks have provided a direct estimate of the black hole mass. In both of these galaxies there is evidence for offsets between the black hole and the galaxy center; in velocity {M84} and in position {NGC 4261}. Some models for shallow cuspy light profiles in luminous ellipticals require that black holes spiral into the galaxy center. We estimate that a massive black hole, if offset from the center of the galaxy, should distort the stellar distribution over a region large enough that we should see a wake or asymmetry in the isophotes. However study of the stellar distribution in the nuclear regions is complicated by the presence of the dust itself. Near-IR images will provide more accurate measurements of the surface brightness profiles in the central arcsec of these galaxies, allowing us to see directly how the black hole is affecting the stellar distribution. Study of shape and symmetry of the stellar profiles in the central regions should determine if they are consistent with the gas disk/black hole systems moving with respect to the stellar component of the galaxy and allow us to test models for how the black hole spirals into the center of galaxy. Near-IR colors maps will determine the location of dense gas responsible for the obscuration and fueling of the AGNs.
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