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ALMA resolves the torus of NGC 1068: Continuum and molecular line emission

S. Garcia-Burillo ; F. Combes ; C. R. Almeida ; A. Usero ; M. Krips ; A. Alonso-Herrero ; Susanne Aalto (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; V. Casasola ; L. K. Hunt ; S. Martin ; S. Viti ; L. Colina ; Francesco Costagliola (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; A. Eckart ; A. Fuente ; C. Henkel ; I. Marquez ; R. Neri ; E. Schinnerer ; L. J. Tacconi ; P. P. van der Werf
Astrophysical Journal Letters (2041-8205). Vol. 823 (2016), 1, p. Art. no. L12.
[Artikel, refereegranskad vetenskaplig]

We used the Atacama Large Millimeter Array (ALMA) to map the emission of the CO(6-5) molecular line and the 432 mu m continuum emission from the 300 pc sized circumnuclear disk (CND) of the nearby Seyfert 2 galaxy NGC 1068 with a spatial resolution of similar to 4 pc. These observations spatially resolve the CND and, for the first time, image the dust emission, the molecular gas distribution, and the kinematics from a 7-10 pc diameter disk that represents the submillimeter counterpart of the putative torus of NGC 1068. We fitted the nuclear spectral energy distribution of the torus using ALMA and near-and mid-infrared (NIR/MIR) data with CLUMPY torus models. The mass and radius of the best-fit solution for the torus are both consistent with the values derived from the ALMA data alone: M-gas(torus) = (1 +/- 0.3) x 10(5) M-circle dot and R-torus = 3.5 +/- 0.5 pc. The dynamics of the molecular gas in the torus show strong non-circular motions and enhanced turbulence superposed on a surprisingly slow rotation pattern of the disk. By contrast with the nearly edge-on orientation of the H2O megamaser disk, we found evidence suggesting that the molecular torus is less inclined (i = 34 degrees-66 degrees) at larger radii. The lopsided morphology and complex kinematics of the torus could be the signature of the Papaloizou-Pringle instability, long predicted to likely drive the dynamical evolution of active galactic nuclei tori.

Nyckelord: galaxies: individual (NGC 1068), galaxies: ISM, galaxies: kinematics and dynamics, galaxies: nuclei, galaxies: Seyfert



Denna post skapades 2016-06-27. Senast ändrad 2016-07-05.
CPL Pubid: 238375

 

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