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Title:
The Megamaser Cosmology Project: precise black hole mass measurement and the implication for the M BH-sigma* relation
Authors:
Kuo, Cheng-Yu; Braatz, James A.; Condon, James J.; Impellizzeri, Caterina M. V.; Lo, Kwok-Yung; Zaw, Ingyin; Henkel, Christian; Reid, Mark J.; Greene, Jenny E.; Gao, Feng; Zhao, Wei
Affiliation:
AA(Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan ), AB(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AC(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AD(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AE(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AF(New York University Abu Dhabi, Abu Dhabi, UAE), AG(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA), AI(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AJ(Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, China), AK(Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, China)
Publication:
Star Clusters and Black Holes in Galaxies across Cosmic Time, Proceedings of the International Astronomical Union, IAU Symposium, Volume 312, pp. 56-60
Publication Date:
02/2016
Origin:
CUP
Keywords:
accretion disks, water maser, Seyfert galaxies, black hole mass,
Abstract Copyright:
(c) 2016: Copyright © International Astronomical Union 2016
DOI:
10.1017/S1743921315007474
Bibliographic Code:
2016IAUS..312...56K

Abstract

We made dynamical black hole mass measurements from nineteen Seyfert 2 galaxies which host sub-parsec H2O maser disks using the H2O megamaser technique. The nearly perfect Keplerian rotation curves in many of these maser systems guarantee the high accuracy and precision of the black hole mass measurements. With the stellar velocity dispersion (sigma*) of the galaxy bulges measured with the Dupont 2.5 m telescope at Las Campanas Observatory in the South and the Apache Point Observatory (APO) 3.5m telescope in the North, we found that H2O maser galaxies, most of which host pseudo bulges rather than classical bulges, do not all follow the M BH -sigma* relation shown in the literature. This result is well consistent with the latest findings by Kormendy & Ho (2013) that only early type galaxies and galaxies with classical bulges follow a tight MBH-sigma* relation. Such a tight correlation may not exist in pseudo bulge galaxies.
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