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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 ,
M. R. Morris  and
W. M. Goss
J.-H. Zhao
Affiliation:
Harvard-Smithsonian CfA, 60 Garden Street, MS 78, Cambridge, MA 02138, USA email: [email protected]
M. R. Morris
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA email: [email protected]
W. M. Goss
Affiliation:
NRAO, P. O. Box O, Socorro, NM 87801, USA email: [email protected]
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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.

Keywords

Galactic center — ISM — supernova remnants — neutron stars — winds — outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 364 - 368
Copyright
Copyright © International Astronomical Union 2014 

References

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