XMM-Newton Proposal 02022304

Details XMM-Newton Proposal 02022304 XMM-Newton Proposal 02022304

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..120b&link_type=abstract

XMM-Newton Proposal ID #02022304

Computer Science

Rx J0042.6+4115, Rx J0042.6+4115, Rx J0042.6+4115, Rx J0042.6+4115, Xmm-Newton Proposal 02022304

Scientific paper

A Z-source candidate has been identified in the core of M31 using data from existing XMM-Newton observations. Z-sources are perhaps the most extreme form of neutron star binary; powered by Roche lobe overflow from a low mass secondary via disc accretion, their X-ray luminosities can reach 10^39 erg/s,and exhibit complex correlations between luminosity and X-ray spectra so thatthey trace out Z-shapes in colour-colour diagrams over a few days. We propose a programme of four 20 ks observations over 4 days to trace the Z-track, which will conclusively prove whether or not the candidate is a Z-source. Also, the programme would access for the first time variability over time-scales of a few days in the 120 sources in the field of view.

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