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dc.contributor.authorWalsh, Jonelle L.
dc.contributor.authorvan den Bosch, Remco C. E.
dc.contributor.authorBarth, Aaron J.
dc.contributor.authorSarzi, Marc
dc.date.accessioned2012-08-02T15:00:55Z
dc.date.available2012-08-02T15:00:55Z
dc.date.issued2012-07-01
dc.identifier.citationWalsh , J L , van den Bosch , R C E , Barth , A J & Sarzi , M 2012 , ' A stellar dynamical mass measurement of the black hole in NGC 3998 from Keck adaptive optics observations. ' , The Astrophysical Journal , vol. 753 , no. 1 , 79 . https://doi.org/10.1088/0004-637X/753/1/79
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 961601
dc.identifier.otherPURE UUID: 22c87ed2-641f-4942-bd73-3724d3f711c8
dc.identifier.otherWOS: 000305632500079
dc.identifier.otherScopus: 84862514298
dc.identifier.urihttp://hdl.handle.net/2299/8779
dc.description.abstractWe present a new stellar dynamical mass measurement of the black hole in the nearby, S0 galaxy NGC 3998. By combining laser guide star adaptive optics observations obtained with the OH-Suppressing Infrared Imaging Spectrograph on the Keck II telescope with long-slit spectroscopy from the Hubble Space Telescope and the Keck I telescope, we map out the stellar kinematics on both small spatial scales, well within the black hole sphere of influence, and large scales. We find that the galaxy is rapidly rotating and exhibits a sharp central peak in the velocity dispersion. Using the kinematics and the stellar luminosity density derived from imaging observations, we construct three-integral, orbit-based, triaxial stellar dynamical models. We find the black hole has a mass of M-BH = (8.1(-1.9)(+2.0)) x 10(8) M-circle dot, with an I-band stellar mass-to-light ratio of M/L = 5.0(-0.4)(+0.3) M-circle dot/L-circle dot (3 sigma uncertainties), and that the intrinsic shape of the galaxy is very round, but oblate. With the work presented here, NGC 3998 is now one of a very small number of galaxies for which both stellar and gas dynamical modeling have been used to measure the mass of the black hole. The stellar dynamical mass is nearly a factor of four larger than the previous gas dynamical black hole mass measurement. Given that this cross-check has so far only been attempted on a few galaxies with mixed results, carrying out similar studies in other objects is essential for quantifying the magnitude and distribution of the cosmic scatter in the black hole mass-host galaxy relations.en
dc.format.extent18
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.titleA stellar dynamical mass measurement of the black hole in NGC 3998 from Keck adaptive optics observations.en
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2012-07-01
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/753/1/79
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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