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Title: Refining the M {sub BH}-V {sub c} scaling relation with H I rotation curves of water megamaser galaxies

Black-hole-galaxy scaling relations provide information about the coevolution of supermassive black holes and their host galaxies. We compare the black-hole mass-circular-velocity (M {sub BH}-V {sub c}) relation with the black-hole-mass-bulge-stellar-velocity-dispersion (M {sub BH}-σ{sub *}) relation to see whether the scaling relations can passively emerge from a large number of mergers or require a physical mechanism, such as feedback from an active nucleus. We present Very Large Array H I observations of five galaxies, including three water megamaser galaxies, to measure the circular velocity. Using 22 galaxies with dynamical M {sub BH} measurements and V {sub c} measurements extending to large radius, our best-fit M {sub BH}-V {sub c} relation, log M{sub BH}=α+βlog (V{sub c}/200 km s{sup −1}), yields α=7.43{sub −0.13}{sup +0.13}, β=3.68{sub −1.20}{sup +1.23}, and an intrinsic scatter ϵ{sub int}=0.51{sub −0.09}{sup +0.11}. The intrinsic scatter may well be higher than 0.51, as we take great care to ascribe conservatively large observational errors. We find comparable scatter in the M {sub BH}-σ{sub *} relations, ϵ{sub int}=0.48{sub −0.08}{sup +0.10}, while pure merging scenarios would likely result in a tighter scaling with the dark halo (as traced by V {sub c}) properties rather than the baryonic (σ{sub *}) properties. Instead, feedback from the active nucleusmore » may act on bulge scales to tighten the M {sub BH}-σ{sub *} relation with respect to the M {sub BH}-V {sub c} relation, as observed.« less
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Department of Astrophysics, Princeton University, Princeton, NJ 08540 (United States)
  2. National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
  3. Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China)
  4. McDonald Observatory, The University of Texas, Austin, TX 78712 (United States)
Publication Date:
OSTI Identifier:
22342011
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; BLACK HOLES; COMPARATIVE EVALUATIONS; DISPERSIONS; FEEDBACK; GALAXIES; GALAXY NUCLEI; MASS; QUASARS; ROTATION; SCALING; VELOCITY; WATER