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

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)56-60
Number of pages5
JournalProceedings of the International Astronomical Union
Volume10
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

Keywords

  • Seyfert galaxies
  • accretion disks
  • black hole mass
  • water maser

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    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 MBH-σ∗ relation. Proceedings of the International Astronomical Union, 10, 56-60. https://doi.org/10.1017/S1743921315007474