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WISDOM project-I: black hole mass measurement using molecular gas kinematics in NGC 3665

Onishi, Kyoko, Iguchi, Satoru, Davis, Timothy A. ORCID:, Bureau, Martin, Cappellari, Michele, Sarzi, Marc and Blitz, Leo 2017. WISDOM project-I: black hole mass measurement using molecular gas kinematics in NGC 3665. Monthly Notices of the Royal Astronomical Society 468 (4) , pp. 4663-4674. 10.1093/mnras/stx631

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As a part of the mm-Wave Interferometric Survey of Dark Object Masses (WISDOM) project, we present an estimate of the mass of the supermassive black hole (SMBH) in the nearby fast-rotator early-type galaxy NGC 3665. We obtained the Combined Array for Research in Millimeter Astronomy (CARMA) B and C array observations of the 12CO(J = 2 − 1) emission line with a combined angular resolution of 0.59 arcsec. We analysed and modelled the three-dimensional molecular gas kinematics, obtaining a best-fitting SMBH mass MBH=5.75+1.49−1.18×108 MBH=5.75−1.18+1.49×108 M⊙, a mass-to-light ratio at H-band (M/L)H = 1.45 ± 0.04 (M/L)⊙,H and other parameters describing the geometry of the molecular gas disc (statistical errors, all at 3σ confidence). We estimate the systematic uncertainties on the stellar M/L to be ≈0.2 (M/L)⊙,H, and on the SMBH mass to be ≈0.4 × 108 M⊙. The measured SMBH mass is consistent with that estimated from the latest correlations with galaxy properties. Following our older works, we also analysed and modelled the kinematics using only the major-axis position–velocity diagram, and conclude that the two methods are consistent.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: galaxies: active, galaxies: elliptical and lenticular, cD, galaxies: individual: NGC 3665, galaxies: ISM, galaxies: kinematics and dynamics, galaxies: nuclei
Additional Information: PDF uploaded in accordance with publisher's policies at (accessed 24.3.17).
Publisher: Oxford Acadmic
ISSN: 0035-8711
Funders: STFC
Date of First Compliant Deposit: 21 March 2017
Date of Acceptance: 13 March 2017
Last Modified: 13 Nov 2023 18:50

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