Molecular gas streamers feeding and obscuring the active nucleus of NGC1068

Details Molecular gas streamers feeding and obscuring the active nucleus of NGC1068 Molecular gas streamers feeding and obscuring the active nucleus of NGC1068

2008-09-29

arxiv.org/abs/0809.4943v1

Astrophys.J.691:749-759,2009

Astronomy and Astrophysics

Astrophysics

33 pages, 9 figures, Accepted for publication in ApJ, Version with high resolution figures available at http://www.mpe.mpg.d

Scientific paper

10.1088/0004-637X/691/1/749

We report the first direct observations of neutral, molecular gas streaming in the nucleus of NGC1068 on scales of <30 pc using SINFONI near-infrared integral field spectroscopy. At a resolution of 0.075", the flux map of 2.12 $\mu$m 1-0 S(1) molecular hydrogen emission around the nucleus in the central arcsec reveals two prominent linear structures leading to the AGN from the north and south. The kinematics of the gas in these features are dominated by non-circular motions and indicate that material is streaming towards the nucleus on highly elliptical or parabolic trajectories whose orientations are compatible with that of the disk plane of the galaxy. We interpret the data as evidence for fueling of gas to the central region. The radial transport rate from ~30 pc to a few parsec from the nucleus is ~15 M$_\sun$ yr$^{-1}$. One of the infalling clouds lies directly in front of the central engine. We interpret it as a tidally disrupted streamer that forms the optically thick outerpart of an amorphous clumpy molecular/dusty structure which contributes to the nuclear obscuration.

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