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New HI Observations of the prototype Polar Ring Galaxy NGC 4650A

Published online by Cambridge University Press:  05 March 2013

Magda Arnaboldi
Magda Arnaboldi*
Affiliation:
Mount Stromlo and Siding Spring Observatories, Private Bag, Weston Creek PO, ACT 2611, Australia; magda@mso.anu.edu.au
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Abstract

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New, high-resolution observations of the HI emission line and 20 cm continuum at the Australia Telescope Compact Array (ATCA) for the prototype polar ring galaxy NGC 4650A are presented. They show the presence of a far more extended HI distribution than previously observed with the VLA, and a very regular velocity field out to a distance of ∼50 kpc. The combined analysis of the HI data with optical and near-infrared (NIR) images argues against previous warp models used to describe the dynamics of this object. Further analysis of the new B-band image obtained at the European Southern Observatories New Technology Telescope (NTT) indicates clearly that the polar structure extends continuously to within about 200 pc of the nucleus of the central host galaxy, ruling out the presence of a ‘hole’ in the central region of this component. The presence of two spiral arms stretching out in the polar disk seems to represent the most likely explanation for the observed morphology and kinematics.

Keywords

galaxies: individual (NGC 4650A)galaxies: kinematic and dynamicsdark matter
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 92 - 95
Copyright
Copyright © Astronomical Society of Australia 1997

References

Arnaboldi, M., & Galletta, G. 1993, A&A, 268, 411 Google Scholar
Arnaboldi, M., Freeman, K. C., Sackett, P. D., Sparke, L. S., & Capaccioli, M. 1995, P&SS, 43, 1377 Google Scholar
Arnaboldi, M., Oosterloo, T., Combes, F., Freeman, K., & Koribalski, B. 1996, AJ, in pressGoogle Scholar
Combes, F., & Arnaboldi, M. 1996, A&A, 305, 763 Google Scholar
de Jong, R. S., & van der Kruit, P. C. 1994, A&A Suppl. Ser., 106, 451 Google Scholar
Freeman, K. C. 1993, in Physics of Nearby Galaxies: Nature or Nurture?, ed. T. X. Thuan, C. Balkowski, & J. T. T. Van (Gif-sur-Yvette: Ed. Frontières), p. 201 Google Scholar
Sackett, P. D., & Sparke, L. S. 1990, ApJ, 361, 408 (SS)CrossRefGoogle Scholar
Sackett, P. D., Rix, H.-W., Jarvis, B. J., & Freeman, K. C. 1994, ApJ, 436, 629 (S94)CrossRefGoogle Scholar
Schweizer, F., Whitmore, B. C., & Rubin, V. C. 1983, AJ, 88, 909 CrossRefGoogle Scholar
van Driel, W., et al. 1995, AJ, 109, 943 Google Scholar
van Gorkom, J. H., Schechter, P. L., & Kristian, J. 1987, ApJ, 314, 457 (vGSK87)Google Scholar
Warren, M. S., Quinn, P. J., Salmon, J. K., & Zurek, W. H. 1992, ApJ, 399, 405 Google Scholar
Whitmore, B. C., McElroy, D. B., & Schweizer, F. 1987, ApJ, 314, 439 (WMS)CrossRefGoogle Scholar
Whitmore, B. C., et al. 1990, AJ, 100, 1489 CrossRefGoogle Scholar