Astrophys. J., 778, 47 (2013/November-3)
Refining the MBH-vc scaling relation with H I rotation curves of water megamaser galaxies.
SUN A.-L., GREENE J.E., IMPELLIZZERI C.M.V., KUO C.-Y., BRAATZ J.A. and TUTTLE S.
Abstract (from CDS):
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 (MBH-Vc) relation with the black-hole-mass-bulge-stellar-velocity-dispersion (MBH-σ*) 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 MBH measurements and Vc measurements extending to large radius, our best-fit MBH-Vcrelation, logMBH = α + βlog(Vc/200km/s) , yields α = 7.43–0.13+0.13, β = 3.68–1.20+1.23, and an intrinsic scatter ∈int = 0.51–0.09+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 MBH-σ* relations, ∈int = 0.48–0.08+0.10., while pure merging scenarios would likely result in a tighter scaling with the dark halo (as traced by Vc) properties rather than the baryonic (σ*) properties. Instead, feedback from the active nucleus may act on bulge scales to tighten the MBH-σ* relation with respect to the MBH-Vcrelation, as observed.
quasars: supermassive black holes
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