The molecular H2 and stellar discs in the nuclear region of NGC 4258

Abstract

NGC 4258 is an SABbc Seyfert galaxy, located at a distance of $7.2\pm 0.3$ 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 H${}_2$O maser emission allows a very precise measurement of the central supermassive black hole mass ($M_{\bullet }(maser)=3.78\pm 0.01\times 10^7$ Mo). 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 H${}_2\lambda 2.1218$ $\mu$m and Br$\gamma$ emission lines, the latter having a broad component with FWHM${}_{Br\gamma }(broad)=1600\pm 29$ km s${}^{-1}$. The spatial morphology and kinematics of the H${}_2\lambda 2.1218$ $\mu$m 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 H${}_2$ emitting disc detected in this work, and also to the H${}_2$O 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 ($M_{\bullet }(disc)=2.8\pm 1.0\times 10^7$ Mo) is compatible, at 1$\sigma$ level, with the precise measurement resulting from the H${}_2$O maser emission.

arXiv comment15 pages, 10 figures, 1 table, published in MNRAS

References in corpus (41)

• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• The Demography of Massive Dark Objects in Galaxy Centres
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• The M-sigma and M-L Relations in Galactic Bulges and Determinations of their Intrinsic Scatter
• A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies
• The SAURON project - V. Integral-field emission-line kinematics of 48 elliptical and lenticular galaxies
• Measuring the inclination and mass-to-light ratio of axisymmetric galaxies via anisotropic Jeans models of stellar kinematics
• Efficient Multi-Gaussian Expansion of galaxies
• A 4% Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk
• A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
• The Atlas3D project - X. On the origin of the molecular and ionised gas in early-type galaxies
• The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks
• Star formation in a galactic outflow
• Evidence for non-evolving FeII/MgII ratios in rapidly accreting z~6 QSOs
• The Geometry of and Mass Accretion Rate through the Maser Accretion Disk in NGC 4258
• An Eccentric Disk Model for the Nucleus of M31
• X-ray Properties of LINERs and Low-luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results
• X-ray Constraints on Accretion and Starburst Processes in Galactic Nuclei I. Spectral Results
• The Gemini spectral library of near-IR late type stellar templates and its application for velocity dispersion measurements
• PCA Tomography: how to extract information from datacubes
• A Stellar Dynamical Measurement of the Black Hole Mass in the Maser Galaxy NGC 4258
• NGC4258: a jet-dominated low-luminosity AGN?
• Eccentric-disk models for the nucleus of M31
• Orbit-Based Dynamical Models of the Sombrero Galaxy (NGC 4594)
• Chandra Observations and the Nature of the Anomalous Arms of NGC 4258 (M 106)
• A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151
• Decoupled gas kinematics in isolated S0 galaxies
• A treatment procedure for VLT/SINFONI data cubes: application to NGC 5643
• High Resolution Infrared Imaging of the Compact Nuclear Source in NGC4258
• A deep X-ray observation of NGC 4258 and its surrounding field
• Dynamical Modeling of the Stellar Nucleus of M31
• The benchmark black hole in NGC 4258: dynamical models from high-resolution two-dimensional stellar kinematics
• Self-Gravitating Eccentric Disk Models for the Double Nucleus of M31
• Spatially resolved X-ray spectra of NGC 4258
• Chandra X-ray Observations of NGC 4258: Iron Absorption Lines from the Nucleus
• Radio Continuum Imaging of the Spiral Galaxy NGC 4258
• Discovery of an Halpha emitting disk around the supermassive black hole of M31
• Structure and Kinematics of CO (J=2-1) Emission in the Central Region of NGC 4258
• The molecular H2 emission and the stellar kinematics in the nuclear region of the Sombrero galaxy

Cited by in corpus (5)

• A Slowly Precessing Disk in the Nucleus of M31 as the Feeding Mechanism for a Central Starburst
• Can supernova shells feed supermassive black holes in galactic nuclei?
• Effect of accreting tidally disrupted stars on the spin evolution of $\sim 10^6{M}_{\odot }$ black holes
• The DIVING${}^{3D}$ Survey -- Deep IFS View of Nuclei of Galaxies -- I. Definition and Sample Presentation
• Partial alignment between jets and megamasers: Coherent versus selective accretion