The Megamaser Cosmology Project: Precise black hole mass measurement and the implication for the MBH-σ∗ relation

Cheng Yu Kuo; James A. Braatz; James J. Condon; Caterina M.V. Impellizzeri; Kwok Yung Lo; Ingyin Zaw; Christian Henkel; Mark J. Reid; Jenny E. Greene; Feng Gao; Wei Zhao

doi:10.1017/S1743921315007474

The Megamaser Cosmology Project: Precise black hole mass measurement and the implication for the M_BH-σ∗ relation

Cheng Yu Kuo, James A. Braatz, James J. Condon, Caterina M.V. Impellizzeri, Kwok Yung Lo, Ingyin Zaw, Christian Henkel, Mark J. Reid, Jenny E. Greene, Feng Gao, Wei Zhao

Physics

Research output: Contribution to journal › Article › peer-review

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 (σ∗) 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 -σ∗ 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 M_BH-σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.

Original language	English (US)
Pages (from-to)	56-60
Number of pages	5
Journal	Proceedings of the International Astronomical Union
Volume	10
DOIs	https://doi.org/10.1017/S1743921315007474
State	Published - 2016

Keywords

Seyfert galaxies
accretion disks
black hole mass
water maser

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1017/S1743921315007474

Cite this

Kuo, C. Y., Braatz, J. A., Condon, J. J., Impellizzeri, C. M. V., Lo, K. Y., Zaw, I., Henkel, C., Reid, M. J., Greene, J. E., Gao, F., & Zhao, W. (2016). The Megamaser Cosmology Project: Precise black hole mass measurement and the implication for the M_BH-σ∗ relation. Proceedings of the International Astronomical Union, 10, 56-60. https://doi.org/10.1017/S1743921315007474

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title = "The Megamaser Cosmology Project: Precise black hole mass measurement and the implication for the MBH-σ∗ relation",

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 (σ∗) 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 MBH -σ∗ 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-σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.",

keywords = "Seyfert galaxies, accretion disks, black hole mass, water maser",

author = "Kuo, {Cheng Yu} and Braatz, {James A.} and Condon, {James J.} and Impellizzeri, {Caterina M.V.} and Lo, {Kwok Yung} and Ingyin Zaw and Christian Henkel and Reid, {Mark J.} and Greene, {Jenny E.} and Feng Gao and Wei Zhao",

note = "Publisher Copyright: Copyright {\textcopyright} 2016 International Astronomical Union.",

year = "2016",

doi = "10.1017/S1743921315007474",

language = "English (US)",

volume = "10",

pages = "56--60",

journal = "Proceedings of the International Astronomical Union",

issn = "1743-9213",

publisher = "Cambridge University Press",

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T2 - Precise black hole mass measurement and the implication for the MBH-σ∗ relation

AU - Kuo, Cheng Yu

AU - Braatz, James A.

AU - Condon, James J.

AU - Impellizzeri, Caterina M.V.

AU - Lo, Kwok Yung

AU - Zaw, Ingyin

AU - Henkel, Christian

AU - Reid, Mark J.

AU - Greene, Jenny E.

AU - Gao, Feng

AU - Zhao, Wei

PY - 2016

Y1 - 2016

N2 - 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 (σ∗) 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 MBH -σ∗ 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-σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.

AB - 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 (σ∗) 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 MBH -σ∗ 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-σ∗ relation. Such a tight correlation may not exist in pseudo bulge galaxies.

KW - Seyfert galaxies

KW - accretion disks

KW - black hole mass

KW - water maser

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