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Neutral Hydrogen in the Bar of NGC 4151

Published online by Cambridge University Press:  12 April 2016

C. G. Mundell ,
A. Pedlar ,
D. L. Shone ,
M. W. Asif ,
A. Robinson  and
D. J. Axon
C. G. Mundell
Affiliation:
University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, U.K.
A. Pedlar
Affiliation:
University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, U.K.
D. L. Shone
Affiliation:
University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, U.K.
M. W. Asif
Affiliation:
Royal Greenwich Observatory, Madingly Rd., Cambridge CBS OEZ, UK
A. Robinson
Affiliation:
University of Cambridge, Institute of Astronomy, Madingly Road, Cambridge CB3 0HA, U.K.
D. J. Axon
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218

Extract

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Bars are thought to play a crucial role in the fueling of AGN (see e.g., Mundell et al., in these proceedings and references therein), and as part of a project to investigate this, we have studied the neutral hydrogen structure in the bar of the Seyfert 1.5 galaxy NGC 4151.

High-sensitivity VLA observations have enabled us to image the neutral hydrogen emission from the bar of NGC 4151 in unprecedented detail, and is a continuation of the work by Pedlar et al. (1992).

Figure 1 shows images of integrated neutral hydrogen emission. The large scale emission extends over approximately 20 kpc and the outer part consists of a well-defined two-armed spiral which originates from a fat bar at a radius of about 5 kpc. The bar shows complex structure, including two sharp features which are reminiscent of the shocks seen in many simulations, e.g., Athanassoula (1992). These features appear to join the central 1-kpc ring discovered by Vila-Vilaró et al. (1994), and for which there appears a partial counterpart in neutral hydrogen emission.

Type
Posters for Part III and Part IV
Information
International Astronomical Union Colloquium , Volume 157: Barred Galaxies , 1996 , pp. 242 - 243
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Athanassoula, E. 1992, MNRAS, 259, 345 Google Scholar
Mundell, C.G., Pedlar, A., Baum, S.A., O’Dea, C.P., Gallimore, J.F., & Brinks, E. 1995 MNRAS, 275, 67 Google Scholar
Pedlar, A., Howley, P., Axon., D.J. & Unger, S.W. 1992 MNRAS, 259, 369PGoogle Scholar
Vila-Vilaró, B., Robinson, A., Perez, E., Axon, D.J., Baum, S.A., G onzález-Delgado, R.M., Pedlar, A. et al. 1994, A&A, 302, 58VGoogle Scholar