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2018MNRAS.473.2198M - Mon. Not. R. Astron. Soc., 473, 2198-2211 (2018)
The molecular H2 and stellar discs in the nuclear region of NGC 4258.
MENEZES R.B., DA SILVA P. and STEINER J.E.
Abstract (from CDS):
NGC 4258 is an SABbc Seyfert galaxy, located at a distance of 7.2 ± 0.3 Mpc. This object is well known by its nearly edge-on molecular nuclear disc, located between 0.16 and 0.28 pc from the nucleus, whose H2O maser emission allows a very precise measurement of the central supermassive black hole mass (M{dot}€(maser) = 3.78 ± 0.01 x 107M☉). We analyse the emission line properties and the stellar kinematics in a data cube of the central region of NGC 4258, obtained, in the K band, with the near–infrared integral field spectrograph, at the Gemini–North telescope. The nuclear spectrum, after the starlight subtraction, shows only the H2lambda2.1218 mum and Br gamma emission lines, the latter having a broad component with FWHMBr gamma(broad) = 1600 ± 29 km s–11The spatial morphology and kinematics of the H2lambda2.1218 mum line are consistent with a rotating molecular disc around the supermassive black hole, with an upper limit for its diameter of 15.7 pc. The inner radio jet in this object is, in projection, almost perpendicular to the H2emitting disc detected in this work, and also to the H2O maser emitting disc. The main features of the maps of the stellar kinematic parameters are well reproduced by a model of a thin rotating stellar circular disc. The supermassive black hole mass provided by this dynamical modelling (M{dot}(broad) = 2.8 ± 1.0 x 107M☉) is compatible, at 1sigma level, with the precise measurement resulting from the H2O maser emission.
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Journal keyword(s): techniques: imaging spectroscopy - galaxies: active - galaxies: individual: NGC 4258 - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: Seyfert
Simbad objects: 4
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