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A Wide Field λ90cm Image Around the Galactic Centre - Evidence for a Poloidal Magnetic Field

Published online by Cambridge University Press:  19 July 2016

K. R. Anantharamaiah  and
A. Pedlar
K. R. Anantharamaiah
Affiliation:
Raman Research Institute, Bangalore, India
A. Pedlar
Affiliation:
Nuffield Radio Astronomy Laboratories, Jodrell Bank, U.K.

Extract

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A number of unique non-thermal filamentary structures, which are all roughly perpendicular to the galactic plane have been discovered in the vicinity of the Galactic centre (see Yusef-Zadeh 1989 and references there in). On the basis of their uniformity, polarization angles, rigidity, and pressure balance with the surrounding medium, it has been hypothesized that a strong polodial field of milligauss strength pervades the inner 50 pc of the Galaxy (Morris and Yusef-Zadeh 1989 and Morris in this volume). We present here a single wide-field image, at λ90cm, which shows all the filamentary structures in this region and show that these observations are consistent with the above hypothesis.

Type
7. Magnetic Fields in Galactic Nuclei
Information
Symposium - International Astronomical Union , Volume 140: Galactic and Intergalactic Magnetic Fields , 1990 , pp. 375 - 376
Copyright
Copyright © Kluwer 1990 

References

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Morris, M., and Yusef-Zadeh, F., 1989, Ap. J. , 343, 703 CrossRefGoogle Scholar
Yusef-Zadeh, F., and Morris, M., 1987, A.J. , 94, 1178 CrossRefGoogle Scholar
Yusef-zadeh, F., 1989, in The Center of the Galaxy , ed. Morris, M. Kluwer Academic Publishers, Dordrecht Google Scholar