Circularly Polarized Emission from the Transient Bursting Radio Source GCRT J1745 - 3009
Abstract
We report on the detection of strong circularly polarized emission from the transient bursting source GCRT J1745 - 3009 based on new analysis of 325 MHz Giant Metrewave Radio Telescope observations conducted on 2003 September 28. We place 8 R sun 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 <=4 kpc away could have given rise to the GCRT radio emission.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2010
- DOI:
- arXiv:
- arXiv:1001.5394
- Bibcode:
- 2010ApJ...712L...5R
- Keywords:
-
- Galaxy: center;
- radio continuum: general;
- stars: individual: GCRT J1745 – 3009;
- stars: variables: general;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 17 pages, 3 figures, accepted for publication in ApJ Letters
