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1999MNRAS.304..475M - Mon. Not. R. Astron. Soc., 304, 475-480 (1999/April-2)
Gas dynamics in the barred Seyfert galaxy NGC 4151. I. H I streaming shocks and inflow along the bar.
MUNDELL C.G. and SHONE D.L.
Abstract (from CDS):
The presence and properties of the shocks in NGC 4151 indicate that, in addition to the x1 orbits, the family of x2 orbits exists and is of significant extent in the bar of NGC 4151, with gas streaming from the shocks making the transition between the two families. We therefore suggest that the circumnuclear ellipse, identified optically by previous authors and associated with gas flowing in x2 orbits, has formed as a natural consequence of the gas flows in the bar without the requirement for a second, inner bar.
Observations of HI were previously thought to be ill-suited to the study of bar shocks because of limitations in angular resolution and sensitivity. However, our observations show that, following recent instrumental enhancements, such measurements are now feasible, albeit at the limits of instrumental capability.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): galaxies: active - galaxies: individual: NGC 4151 - galaxies: kinematics and dynamics - galaxies: Seyfert - galaxies: spiral - radio lines: galaxies
Simbad objects: 3
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