Localization and Identification of the X-Ray Transient in NGC 6440

Details Localization and Identification of the X-Ray Transient in NGC 6440 Localization and Identification of the X-Ray Transient in NGC 6440

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop.1037i&link_type=abstract

Chandra Proposal ID #02408061

Physics

Chandra Proposal Id #02408061

Scientific paper

X1745-203 in NGC 6440 is one of five X-ray transients in galactic globular clusters, with recorded outbursts in 1971 and 1998. The last outburst (In 't Zand et al, 1998, A&A 345, 100) was followed up by us with VLT and NTT observations which identified two candidate optical counterparts (Verbunt et al, 2000, A&A 359, 960). Both of these have counterparts in a Chandra observation of NGC 6440 taken during quiescence in July 2000. An accurate position of the X-ray transient while it is active would secure the identification of the quiescent X-ray as well as the optical counterpart. With such an identification, we can study the quiescent X-ray emission and determine what it is due to. One of the most likely explanations is emission from a cooling neutron star; if so, given the known distance, we can directly measure the neutron-star radius. ASM/RXTE observations show that X1745-203 has gone into outburst again, and this presents the opportunity to determine the position of the transient.

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