Digging process in NGC 6951: the molecular disc bumped by the jet
| Autor: | May, D., Steiner, J. E., Ricci, T. V., Menezes, R. B., Andrade, I. S. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | MNRAS 457, 949 to 970 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stv2929 |
| Popis: | 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$47 pc, PA=124$\deg$ and velocity range from -40 to +40 km s$^{-1}$. This disc is misaligned by 32$\deg$ 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\times10^{6}$$M_{\odot}$. This is an interesting case of an object presenting evidence of a connected feeding-feedback structure. Comment: 22 pages, 24 figures |
| Databáze: | arXiv |
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