Do the Most Powerful Radio Galaxies Host the Most Massive Black Holes ?

Details Do the Most Powerful Radio Galaxies Host the Most Massive Black Holes ? Do the Most Powerful Radio Galaxies Host the Most Massive Black Holes ?

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9495m&link_type=abstract

HST Proposal ID #9495

Physics

Hst Proposal Id #9495

Scientific paper

The 3CR Snapshot Imaging Survey that we have undertaken has revealed the existence of spectacular sub-arcsecond emission- line disks in three FR II radio galaxies : 3C 109, 3C 184.1, and 3C 382. They span a redshift range of 0.06 < z < 0.31, have diameters of 3-15 kpc, and have nearly orthogonal disk and radio jet axes. We propose to measure the black hole {BH} masses in these three galaxies with STIS/G750M and test whether the masses correlate more tightly with the optical bulge luminosity, the radio luminosity, or the nuclear velocity dispersion. These will represent the first mass determinations of BHs in FR II galaxies. For 3C 184.1 and 3C 382, the radio M_BH-L_5_GHz correlation predicts BH masses {{11, 8}x10^9 M_sun} that are factors of 10-55 greater than predicted by the optical M_BH-L_B relation {{0.2, 1}x10^9 M_sun}, while for 3C 109, both relations yield a stunning BH mass of 20x10^9 M_sun. A positive detection of these extreme BH masses would confirm radio luminosity as a sensitive indicator of BH mass and will extend the M_o-Sigma, M_BH-L_B, and M_BH-L_5_GHz relations to unprecedentedly large BH masses. Additionally, line and continuum diagnostics will be performed over 2900-10300 Ang to determine the physics of the disks {shocks vs. photoionization}. This study will help constrain any evolutionary sequence between the BH masses and disks of the two FR types.

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