Sensitive X-ray surveys of nearby globular clusters NGC 6544, NGC 6838 {m71}, and NGC 6656 {M22}

Details Sensitive X-ray surveys of nearby globular clusters NGC 6544, NGC 6838 {m71}, and NGC 6656 {M22} Sensitive X-ray surveys of nearby globular clusters NGC 6544, NGC 6838 {m71}, and NGC 6656 {M22}

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10344e&link_type=abstract

HST Proposal ID #10344

Physics

Hst Proposal Id #10344

Scientific paper

We propose moderately deep ACIS-S surveys of the nearby globular clusters NGC 6544, NGC 6838 {m71}, and NGC 6656 {M22}. We request two orbits of HST/ACS time to study the crowded core of NGC 6544. Existing archival HST and ground-based optical data suffice for M22 and M71. These observations will provide high-sensitivity surveys of the quiescent low-mass x-ray binary, cataclysmic variable, milli-second pulsar, and chromospherically active binary populations of these clusters, important inputs to models of globular cluster evolution. We will detect the newly discovered milli-second pulsars in NGC 6544 and M71 if they are as bright as the faint milli-second pulsars in 47-Tuc. We will confirm or exclude the identification of an apparent dwarf nova with an x-ray source in the core of M22.

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