Chandra observations of accretion-driven millisecond X-ray pulsars in quiescence

Physics

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Chandra Proposal Id #05400417

Scientific paper

We propose observations of the most recently discovered accretion-driven millisecond X-ray pulsars when they are in quiescence. Our observations will elucidate the reason(s) behind the enigmatic quiescent properties of SAX J1808.4-3658, which so far is the only accretion driven millisecond X-ray pulsar detected and studied in quiescence. We will be able to determine whether SAX J1808.4-3658 has unique quiescent properties (caused by some unique feature) or whether its behaviour is a common property of millisecond X-ray pulsars. In the former case, we expect the quiescent properties of our targets to be similar to the majority of quiescent neutron stars. In the latter case, we expect our targets to have a low quiescent X-ray luminosity (<10^{32} ergs/s) and hard, power-law shaped spectra.

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