Deep Chandra and Hubble Observations of NGC 1023: Testing the Origin of Low-Mass X-ray Binaries in a Lenticular Galaxy

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Chandra Proposal Id #08620639

Scientific paper

Extragalactic low-mass X-ray binaries (LMXBs) can constrain galaxy histories, but we must first understand whether LMXBs present in the fields of galaxies were formed primordially in situ or dynamically in globular clusters (GCs). We propose 192 ks of ACIS-S observations + 8 orbits of HST-ACS on NGC1023, one of the nearest, massive lenticular galaxies. We will detect ~120 LMXBs and ~400 stellar clusters. Our comparison of the spatial distributions of field-LMXBs, GCs, and field stars in NGC1023 will constrain the origin of field LMXBs. Our observations will also perform the most complete census of diffuse star clusters (DSCs) to date. By probing the connection of DSCs to LMXBs, we will also test the dynamical formation model of LMXBs in stellar clusters.

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