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A new perspective on the radio active zone at the Galactic center – feedback from nuclear activities

Published online by Cambridge University Press:  22 May 2014

J.-H. Zhao
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS 78, Cambridge, MA 02138, USA email: jzhao@cfa.harvard.edu
M. R. Morris
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA email: morris@astro.ucla.edu
W. M. Goss
Affiliation:
NRAO, P. O. Box O, Socorro, NM 87801, USA email: mgoss@aoc.nrao.edu
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Abstract

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Based on our deep image of Sgr A using broadband data observed with the VLA at 6 cm, we present a new perspective of the radio bright zone at the Galactic center. We further show the radio detection of the X-ray Cannonball, a candidate neutron star associated with the Galactic center SNR Sgr A East. The radio image is compared with the Chandra X-ray image to show the detailed structure of the radio counterparts of the bipolar X-ray lobes. The bipolar lobes are likely produced by the winds from the activities within Sgr A West, which could be collimated by the inertia of gas in the CND, or by the momentum driving of Sgr A*; and the poloidal magnetic fields likely play an important role in the collimation. The less-collimated SE lobe, in comparison to the NW one, is perhaps due to the fact that the Sgr A East SN might have locally reconfigured the magnetic field toward negative galactic latitudes. In agreement with the X-ray observations, the time-scale of ∼1 × 104 yr estimated for the outermost radio ring appears to be comparable to the inferred age of the Sgr A East SNR.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

References

Goss, W. M., Schwarz, U. J., van Gorkom, J. H. & Ekers, R. D. 1985, MNRAS 215, 69Google Scholar
Green, D. A. 1984, MNRAS 209, 449CrossRefGoogle Scholar
Jones, T. W. 1974, A&A, 30, 37Google Scholar
Markoff, S. 2010, Proc. Natl. Acad. Sci. USA 107 (16), 7196Google Scholar
Morris, M., et al. 2003, Astron. Nachr. 324, No. S1, p167Google Scholar
Morris, M. R., Zhao, J.-H. & Goss, W. M. 2013, in these proceedingsGoogle Scholar
Park, S., et al. 2005, ApJ 631, 963Google Scholar
Wang, et al. 2010, MNRAS 402, 895Google Scholar
Zhao, J.-H., Morris, M. R., & Goss, W. M. 2013, ApJ 777, 146Google Scholar