Digging process in NGC 6951: the molecular disc bumped by the jet. Issue 1 (27th January 2016)
- Record Type:
- Journal Article
- Title:
- Digging process in NGC 6951: the molecular disc bumped by the jet. Issue 1 (27th January 2016)
- Main Title:
- Digging process in NGC 6951: the molecular disc bumped by the jet
- Authors:
- May, D.
Steiner, J. E.
Ricci, T. V.
Menezes, R. B.
Andrade, I. S. - Abstract:
- 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 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 −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 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 × 10 6 M⊙ . This is an interesting case of an objectAbstract: 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 −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 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 × 10 6 M⊙ . This is an interesting case of an object presenting evidence of a connected feeding-feedback structure. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 457:Issue 1(2016)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 457:Issue 1(2016)
- Issue Display:
- Volume 457, Issue 1 (2016)
- Year:
- 2016
- Volume:
- 457
- Issue:
- 1
- Issue Sort Value:
- 2016-0457-0001-0000
- Page Start:
- 949
- Page End:
- 970
- Publication Date:
- 2016-01-27
- Subjects:
- techniques: spectroscopic -- galaxies: individual: NGC 6951 -- galaxies: kinematics and dynamics -- galaxies: nuclei
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stv2929 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 20850.xml