The Nature of the Dense Obscuring Material in the Nucleus of NGC 1068

Details The Nature of the Dense Obscuring Material in the Nucleus of NGC 1068 The Nature of the Dense Obscuring Material in the Nucleus of NGC 1068

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311906t&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #119.06; Bulletin of the American Astronomical Society, Vol. 25, p.1471

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results from 3({') '} times 2({') '} observations of the nuclear region of NGC 1068 in the J=1-0 line of HCN obtained with the IRAM Interferometer on the Plateau de Bure, France. Our HCN map reveals the presence of a very strong, resolved nuclear source of about 4({') '} (280 pc at D=14 Mpc) in diameter, as well as clumps of gas associated with a star forming ring located at a radius of 15({') '} from the nucleus. We interpret the nuclear HCN source as a concentration of very dense (N(H_2)>=10(4) cm(-3) ) molecular clouds (mass ~ 5--10times 10(7) M_sun) surrounding the active nucleus. The HCN velocity field clearly shows that the dense gas is rotating. Based on our kinematic analysis of the HCN data were infer that the disk-like structure producing the HCN emission has a low inclination. We also conclude that there are turbulent velocities present in excess of 100 km s(-1) , indicating that the strucure is also very thick. Given this geometry we conclude that the HCN data do not support the current small-scale, dense torus models for unifying the two types of Seyfert galaxies.

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