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Strong magnetic spiral pattern in a ringed galaxy NGC 4736

Published online by Cambridge University Press:  01 July 2007

Krzysztof T. Chyży  and
Ronald Buta
Krzysztof T. Chyży
Affiliation:
Astronomical Observatory of the Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
Ronald Buta
Affiliation:
Department of Physics and Astronomy, University of Alabama, USA
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Abstract

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We present high sensitivity radio polarimetric (VLA) observations of a galaxy with strong orbital resonances – NGC 4736. The total radio intensity at 8.4 GHz covers smoothly the whole galaxy bulge and reveals a distinct ring of radio emission closely related to the ring morphology visible in infrared, CO and Hα emission. However, the magnetic field reveals a very coherent spiral pattern. The magnetic field vectors are crossing the inner starbursting ring, the dust lanes within the ring and other rather circularly shaped features visible in other gas traces. Either the magnetic field uncovers the pattern of gas motions not seen in other spectral ranges, or the spiral magnetic field is of a pure dynamo origin, ignoring the ringed morphology of the galaxy.

Keywords

galaxies: ISMgalaxies: spiralindividual (NGC4736)ISM: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 133 - 134
Copyright
Copyright © International Astronomical Union 2008

References

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