The Masses of the Quasar Relics

Physics

Scientific paper

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Hst Proposal Id #10245 Galaxies

Scientific paper

Guided by the M_bh-sigma relation, we will search for the most massive black holes {BH} in galaxies within 100 Mpc. Our results should {1} explore the nature of the M_bh - sigma relation for the most massive BH; {2} identify the local remnants of the brightest quasars, which should have larger BH masses than any yet detected; and {3} test whether BH masses depend on the core light profile of the host galaxy. High-mass BH are historically under-represented in HST surveys. This proposal exploits a breakthrough - achieved by us in Cycle 10 - of using the Ca H+K region to measure stellar kinematics of high-dispersion galaxies. This permits an extension of a factor of 2.5 in surface brightness in the application of our well-honed observational and theoretical tools for the estimation of BH masses. Searches for BH in galaxy centers have led to the discoveries that {1} most or all hot galaxies contain BHs; {2} the BH mass is well-correlated with the velocity dispersion of the host galaxy bulge and; {3} the numbers and masses of these BH are consistent with the quasar luminosity function and the X-ray background light. These observations suggest a strong link between BH formation, AGN activity, and galaxy formation and their further clarification will inform all these areas. The high-mass end of the BH distribution represents the brightest quasars and the most merged galaxies, but it is poorly defined. This proposal addresses that problem.

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