Circularly polarized emission from the transient bursting radio source GCRT J1745-3009

Details Circularly polarized emission from the transient bursting radio source GCRT J1745-3009 Circularly polarized emission from the transient bursting radio source GCRT J1745-3009

2010-01-29

arxiv.org/abs/1001.5394v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

17 pages, 3 figures, accepted for publication in ApJ Letters

Scientific paper

We report detection of strong circularly polarized emission from the transient bursting source GCRT J1745-3009 based on new analysis of 325 MHz GMRT observations conducted on 28 September 2003. We place 8 Solar radius as the upper limit on the size of the emission region. The implied high brightness temperature required for an object beyond 1 pc and the high fraction of circular polarization firmly establish the emission as coherent. Electron cyclotron or plasma emission from a highly subsolar magnetically dominated dwarf located less than 4 kpc away could have given rise to the GCRT radio emission.

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