X-ray observation of a unique radio transient near the Galactic Center

Details X-ray observation of a unique radio transient near the Galactic Center X-ray observation of a unique radio transient near the Galactic Center

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1861h&link_type=abstract

Chandra Proposal ID #05508196

Physics

Chandra Proposal Id #05508196

Scientific paper

We have detected a new unresolved radio transient using the VLA at 330 MHz (Hyman et al. Nature, submitted) which exhibited 10 min flares to 1 Jy at regular 1.25 hr intervals during a 7-hr observation starting on 2002-09-30. If the source is near the Galactic Center the implied brightness temperature is several orders of magnitude too high to be incoherent synchrotron, implying that this is a new class of coherent emitter. No X-ray emission was seen above 15 mcrab using RXTE bulge scanning data from the previous and following day, but the field has never been observed by Chandra or XMM. We propose a 10 ks observation to search for flaring or quiescent X-ray emission from this source. If a detection is made this will (1) improve the position of the source from 10" to <1", (2) constrain source models based on the X-ray flux and spectrum, and (3) constrain the distance using n_H. If the source is undetected we will still improve constraints on L_x/L_r by several orders of magnitude.

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