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Date and Time of the Query: 2019-06-18 T01:01:03 PDT
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For refcode 2013ApJ...778...47S:
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Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...778...47S Refining the M_BH_-V_c_ Scaling Relation with H I Rotation Curves of Water Megamaser Galaxies Sun, Ai-Lei; Greene, Jenny E.; Impellizzeri, C. M. Violette; Kuo, Cheng-Yu; Braatz, James A.; Tuttle, Sarah Abstract. 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_BH_-V_c_) relation with the black-hole-mass-bulge-stellar-velocity-dispersion (M_BH_-sigma_*_) 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_BH_ measurements and V_c_ measurements extending to large radius, our best-fit M_BH_-V_c_ relation, log M_{BH}_= {alpha} + {beta} log (V_{c}_/ 200 \ km\ s^{-1}), yields {alpha} = 7.43^{+0.13}_{-0.13}_, {beta} = 3.68^{+1.23}_{-1.20}_, and an intrinsic scatter {epsilon}_{int}_=0.51^{+0.11}_{-0.09}_. 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_BH_-sigma_*_ relations, {epsilon}_{int}_ =0.48^{+0.10}_{-0.08}_, while pure merging scenarios would likely result in a tighter scaling with the dark halo (as traced by V_c_) properties rather than the baryonic (sigma_*_) properties. Instead, feedback from the active nucleus may act on bulge scales to tighten the M_BH_-sigma_*_ relation with respect to the M_BH_-V_c_ relation, as observed. Key words: quasars: supermassive black holes
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