Digging process in NGC 6951: the molecular disc bumped by the jet

Abstract

We present a study of the central 200 pc of the galaxy NGC 6951, SAB(rs)bc, an active twin of the Milky Way, at a distance of 24 Mpc. Its nucleus has been observed in the optical with the GMOS-IFU, showing an outflow, and with the HST/ACS, revealing two extended structures with similar orientation, suggesting the presence of a collimating and/or obscuring structure. In order to ascertain this hypothesis, adaptive optics assisted NIR integral field spectroscopic observations were obtained with the NIFS spectrograph in the Gemini North telescope. We detected a compact structure of H${}_2$ molecular gas, interpreted as a nearly edge-on disc with diameter of $\sim$47 pc, PA=124$°$ and velocity range from -40 to +40 km s${}^{-1}$. This disc is misaligned by 32$°$ with respect to the radio jet and the ionization cones seen in the optical. There are two regions of turbulent gas, with position angles similar to the jet/cones, seen both in molecular and ionized phases; these regions are connected to the edges of the molecular disc and coincide with a high ratio of [N II]/H$\alpha$=5, suggesting that these regions are shock excited, partially ionized or both. We explain these structures as a consequence of a "digging process" that the jet inflicts on the disc, ejecting the molecular gas towards the ionization cones. The dynamical mass within 17 pc is estimated as $6.3\times 10^6$$M_{\odot }$. This is an interesting case of an object presenting evidence of a connected feeding-feedback structure.

22 pages, 24 figures

References in corpus (18)

• The Structure of Classical Bulges And Pseudobulges: The Link Between Pseudobulges And Sersic Index
• Alignment of Magnetized Accretion Disks and Relativistic Jets with Spinning Black Holes
• Mapping of the molecular gas inflow towards the Seyfert nucleus of NGC4051 using Gemini NIFS
• Fueling AGN II: Spatially Resolved Molecular Inflows and Outflows
• Mapping Large-Scale Gaseous Outflows in Ultraluminous Infrared Galaxies with Keck II ESI Spectra: Spatial Extent of the Outflow
• Nuclear spirals as feeding channels to the Supermassive Black Hole: the case of the galaxy NGC 6951
• The Central Kiloparsec of Seyfert and Inactive Host Galaxies: a Comparison of Two-Dimensional Stellar and Gaseous Kinematics
• PCA Tomography: how to extract information from datacubes
• Origin and Dynamical Support of Ionized Gas in Galaxy Bulges
• Molecular Gas in NUclei of GAlaxies (NUGA): VI. Detection of a molecular gas disk/torus via HCN in the Seyfert2 galaxy NGC6951?
• Evidence of parsec-scale jets in Low-luminosity Active Galactic Nuclei
• Asymmetries in Extragalactic Double Radio Sources: Clues from 3D Simulations of Jet - Disc Interaction
• A treatment procedure for VLT/SINFONI data cubes: application to NGC 5643
• Integral field unit spectroscopy of 10 early type galactic nuclei: I - Principal component analysis Tomography and nuclear activity
• The evolution of galaxies resolved in space and time: an inside-out growth view from the CALIFA survey
• Discovery of an Halpha emitting disk around the supermassive black hole of M31
• A hot bubble at the centre of M81
• XDR Chemistry in the Circumnuclear Disk of NGC 1068

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