A Chandra/Hubble Study of the Compact Binary Distribution in the Ultrahigh Collision Rate Globular Cluster NGC 6388

Details A Chandra/Hubble Study of the Compact Binary Distribution in the Ultrahigh Collision Rate Globular Cluster NGC 6388 A Chandra/Hubble Study of the Compact Binary Distribution in the Ultrahigh Collision Rate Globular Cluster NGC 6388

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0316m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #03.16; Bulletin of the American Astronomical Society, Vol. 39, p.725

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results from a 50 ksec Chandra ACIS-S observation and Hubble ACS/HRC U and V imaging of the center of the globular cluster NGC 6388. This cluster's large, dense core makes it a prime region for the production of X-ray binaries through dynamical processes. The Chandra observations reveal at least 61 discrete sources within the half-mass radius as determined by previous optical studies. Twenty-two of these sources are found within the core radius of 7.2 arcsec. The sources range in luminosity from 1030-1033 erg/s. Five of the sources are found to be quiescent low-mass X-ray binaries (qLMXBs) based on their location in an X-ray color-magnitude diagram. Analysis of the spatial distribution of the 61 sources show a ratio of X-ray source mass to turnoff mass of 1.6, which is consistent with a mixture of qLMXBs, cataclysmic variables, active binaries, and millisecond pulsars. Four optical counterparts have also been discovered through comparison of the X-ray source positions and optical data from the Hubble ACS/HRC. These candidates were identified based on their location in an optical color-magnitude diagram as well as their variability. Of these, the brightest X-ray source counterpart has a V magnitude of 23.5 and U-V color of -1.2.

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