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2016MNRAS.457..949M - Mon. Not. R. Astron. Soc., 457, 949-970 (2016/March-3)

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


Abstract (from CDS):

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 Integral Field Unit of the Gemini Multi-Object Spectrograph, 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 Near-Infrared Integral Field Spectrograph in the Gemini North telescope. We detected a compact structure of H2 molecular gas, interpreted as a nearly edge-on disc with diameter of ∼47 pc, PA = 124° and velocity range from -40 to +40 km /s. 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 α = 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 x 106 M☉. This is an interesting case of an object presenting evidence of a connected feeding-feedback structure.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: spectroscopic - galaxies: individual: NGC 6951 - galaxies: kinematics and dynamics - galaxies: nuclei

Simbad objects: 13

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