X-ray Binaries in the Ultrahigh Collision Rate Globular Cluster NGC 6388

Computer Science

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Hst Proposal Id #10350

Scientific paper

We propose a joint Chandra-HST study of the massive, high density globular cluster NGC 6388 to study its large expected populations of quiescent low-mass X-ray binaries {qLMXBs} and bright cataclysmic variables {CVs}, and to test for the presence of an intermediate-mass black hole {IMBH}. NGC 6388 has the highest predicted X-ray binary production rate of any Galactic cluster. The qLMXBs will be used to constrain neutron star accretion models, and neutron star masses and radii. The CVs will be used to investigate the effects of cluster structure, metallicity, initial binary fraction, and dynamical history on accreting binary populations. The proposed 3 orbits of HST U-band imaging would complement deep HST V and I-band imaging, already in-hand, for identifying Chandra sources.

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