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Fourier plane modeling of the jet in the galaxy M81

Published online by Cambridge University Press:  24 March 2015

Arvind Ramessur ,
Michael F. Bietenholz ,
Lerothodi L. Leeuw  and
Norbert Bartel
Arvind Ramessur
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, 1740, South Africa College of Graduate Studies, University of South Africa, P.O. Box 392, Unisa, 0003 Pretoria, South Africa
Michael F. Bietenholz
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, 1740, South Africa York University, Department of Physics and Astronomy, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
Lerothodi L. Leeuw
Affiliation:
College of Graduate Studies, University of South Africa, P.O. Box 392, Unisa, 0003 Pretoria, South Africa
Norbert Bartel
Affiliation:
York University, Department of Physics and Astronomy, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
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Abstract

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The nearby spiral galaxy M81 has a low-luminosity Active Galactic Nucleus in its center with a core and a one-sided curved jet, dubbed M81*, that is barely resolved with VLBI. To derive basic parameters such as the length of the jet, its orientation and curvature, the usual method of model-fitting with point sources and elliptical Gaussians may not always be the most appropriate one. We are developing Fourier-plane models for such sources, in particular an asymmetric triangle model to fit the extensive set of VLBI data of M81* in the u-v plane. This method may have an advantage over conventional ones in extracting information close to the resolution limit to provide us with a more comprehensive picture of the structure and evolution of the jet. We report on preliminary results.

Keywords

galaxies: activegalaxies: individual (M81)galaxies: jetsinstrumentation: high angular resolutiontechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 388 - 389
Copyright
Copyright © International Astronomical Union 2015 

References

Bietenholz, M. F., Bartel, N., & Rupen, M. P. 2000, ApJ, 532, 895Google Scholar
Bietenholz, M. F., Bartel, N., & Rupen, M. P. 2004, ApJ, 615, 173Google Scholar
Bracewell, N. R. 2001, The Fourier Transform and Its Applications (3rd ed.New York: McGraw-Hill), pp. 61–65Google Scholar