Circularly polarized emission from the transient bursting radio source GCRT J1745-3009
Subhashis Roy, Scott D. Hyman, Sabyasachi Pal, T. Joseph W. Lazio,, Paul S. Ray, Namir E. Kassim
TL;DR
This paper reports the detection of highly circularly polarized, coherent radio emission from the transient source GCRT J1745-3009, suggesting a magnetically dominated dwarf star as the emission origin.
Contribution
It presents new analysis of GMRT data revealing the polarization and size constraints of GCRT J1745-3009, indicating a coherent emission mechanism from a nearby dwarf star.
Findings
Detected strong circular polarization from GCRT J1745-3009
Placed an 8 Solar radius upper limit on emission region size
Confirmed coherent emission likely from a nearby dwarf star
Abstract
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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