Gas Dynamics in the Barred Seyfert Galaxy NGC4151 - HI Streaming Shocks and Inflow along the Bar

Details Gas Dynamics in the Barred Seyfert Galaxy NGC4151 - HI Streaming Shocks and Inflow along the Bar Gas Dynamics in the Barred Seyfert Galaxy NGC4151 - HI Streaming Shocks and Inflow along the Bar

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dda....30.0107m&link_type=abstract

American Astronomical Society, DDA meeting #30, #01.07; Bulletin of the American Astronomical Society, Vol. 30, p.1140

Astronomy and Astrophysics

Astronomy

Scientific paper

We present sensitive, high resolution observations of neutral hydrogen (HI) in the oval distortion of the Seyfert galaxy NGC4151. We find that the gas dynamics of the oval are consistent with those of a kinematically weak bar. The two bright regions close to the leading edges of the bar in NGC4151 exhibit kinematics strikingly similar to the signature of bar shocks seen in gas-dynamical simulations. The residual velocity field, showing deviations from circular motion, is largely consistent with streaming in a bar potential, and, in addition, clearly shows that inflow is concentrated in narrow regions originating in the shocks. This inflow may represent an early stage in the fuelling process of the AGN. The presence and properties of the shocks indicate that, in addition to the x_1 orbits, the family of x_2 orbits exist and are of significant extent in the bar of NGC4151, with gas streaming from the shocks making the transition between the two families. We suggest that the circumnuclear ellipse, identified optically by previous authors and associated with gas flowing in x_2 orbits, has formed as a natural consequence of the gas flows in the bar without the requirement for a second, inner bar.

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