The Biggest Black Holes

Computer Science

Scientific paper

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Hst Proposal Id #9106 Galaxies

Scientific paper

Searches for supermassive black holes in galaxy centers have led to the discoveries that {1} most or all hot galaxies contain massive dark objects at their centers, presumably black holes; {2} there is a tight correlation between the black-hole mass and the luminosity-weighted velocity dispersion of the hot component of the galaxy. This remarkable relationship suggests a strong link between black-hole formation, AGN activity, and galaxy formation, and once it is understood this link should advance our understanding of all three processes. Guided by the mbh-Sigma relation, we will search for the most massive black holes in galaxies within 100 Mpc. Our results should {1} explore the nature of the mbh-Sigma relation for the most luminous galaxies and the most massive black holes; {2} identify the local remnants of the brightest quasars, which should have larger black-hole masses than any yet detected; {3} test whether black-hole masses depend on the nature of the central region of the host galaxy {core or power-law}. High-mass black holes are difficult to detect, and thus have traditionally been under- represented in HST surveys; however, in the past decade our group has used HST photometry and spectroscopy to investigate the central regions of over 15 galaxies, and we have well- honed observational and theoretical tools for this task.

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