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Is the Bursting Radio-source GCRT J1745-3009 a Double Neutron Star Binary ?

By SpaceRef Editor
August 22, 2005
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Astrophysics, abstract

From: Roberto Turolla [view email]
Date: Thu, 9 Jun 2005 12:36:14 GMT (21kb)

Is the Bursting Radio-source GCRT J1745-3009 a Double Neutron Star
Binary ?

R. Turolla,
A. Possenti,
A. Treves

Comments: 5 pages, 3 figures, accepted for publication in The Astrophysical
Journal Letters

GCRT J1745-3009 is a peculiar transient radio-source in the direction of the
Galactic Center. It was observed to emit a series of ~ 1 Jy bursts at 0.33 GHz,
with typical duration ~ 10 min and at apparently regular intervals of ~ 77 min.
If the source is indeed at the distance of the Galactic Center as it seems
likely, we show that its observational properties are compatible with those
expected from a double neutron star binary, similar to the double pulsar system
J0737-3039. In the picture we propose the (coherent) radio emission comes from
the shock originating in the interaction of the wind of the more energetic
pulsar with the magnetosphere of the companion. The observed modulation of the
radio signal is the consequence of an eccentric orbit, along which the
separation between the two stars varies. This cyclically drives the shock
inside the light cylinder radius of the less energetic pulsar.

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