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  • North, Eve V.Cardiff University (author)

WISDOM project – V. Resolving molecular gas in Keplerian rotation around the supermassive black hole in NGC 0383

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-09-17
  • Oxford University Press (OUP),2019
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:a392fd5f-56c1-483a-b3ed-c01fa7481535
  • https://research.chalmers.se/publication/514065URI
  • https://doi.org/10.1093/mnras/stz2598DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • As part of the mm-Wave Interferometric Survey of Dark Object Masses (WISDOM), we present a measurement of the mass of the supermassive black hole (SMBH) in the nearby early-type galaxy NGC 0383 (radio source 3C 031). This measurement is based on Atacama Large Millimeter/sub-millimeter Array (ALMA) cycle 4 and 5 observations of the 12CO(2–1) emission line with a spatial resolution of 58 × 32 pc2 (0.18 arcsec × 0.1 arcsec). This resolution, combined with a channel width of 10 km s−1, allows us to well resolve the radius of the black hole sphere of influence (measured as RSOI = 316 pc = 0.98 arcsec), where we detect a clear Keplerian increase of the rotation velocities. NGC 0383 has a kinematically relaxed, smooth nuclear molecular gas disc with weak ring/spiral features. We forward model the ALMA data cube with the KINEMATIC MOLECULAR SIMULATION (KinMS) tool and a Bayesian Markov Chain Monte Carlo method to measure an SMBH mass of (4.2 ± 0.7) × 109 M, a F160W-band stellar mass-to-light ratio that varies from 2.8 ± 0.6 M/LF160W in the centre to 2.4 ± 0.3 M/LF160W at the outer edge of the disc and a molecular gas velocity dispersion of 8.3 ± 2.1 km s−1(all 3σ uncertainties). We also detect unresolved continuum emission across the full bandwidth, consistent with synchrotron emission from an active galactic nucleus. This work demonstrates that low-J CO emission can resolve gas very close to the SMBH (≈ 140 000 Schwarzschild radii) and hence that the molecular gas method is highly complimentary to megamaser observations, as it can probe the same emitting material.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Davis, Timothy A.Cardiff University (author)
  • Bureau, M.Yonsei University,University Of Oxford (author)
  • Cappellari, MicheleUniversity Of Oxford (author)
  • Iguchi, SatoruThe Graduate University for Advanced Studies (SOKENDAI),National Astronomical Observatory of Japan (author)
  • Liu, LijieUniversity Of Oxford (author)
  • Onishi, Kyoko,1989Chalmers tekniska högskola,Chalmers University of Technology,Ehime University(Swepub:cth)kyokoo (author)
  • Sarzi, Marc (author)
  • Smith, Mark D.University Of Oxford (author)
  • Williams, Thomas G.Cardiff University (author)
  • Cardiff UniversityYonsei University (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)490:1, s. 319-3300035-87111365-2966

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