Radio Observations of the Bowshock around the Runaway System VELA X-1

Ash, T. D. C.; Ogley, R. N.; Bell Burnell, S. J.; Norton, A. J. and Kaper, L. (1998). Radio Observations of the Bowshock around the Runaway System VELA X-1. In: Neutron Stars and Pulsars : Thirty Years after the Discovery : Proceedings of the International Conference on Neutron Stars and Pulsars, 1997 Nov 17-20, Tachikawa Hall, Rikkyo University, Tokyo, Japan.

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Abstract

The recent discovery of a bowshock around the HMXRB Vela X-1 in the optical and infrared, indicating that the system is moving supersonically with respect to the interstellar medium, prompted a search for a radio counterpart. Observations were made of Vela X-1 using the Australia Telescope Compact Array at 3, 6, 13 and 20 cm. Although the resulting maps show no emission above the noise level from the bowshock, the upper limits on the bowshock's radio emission allow constraints to be put on the density of the shocked gas.

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