Tracing a Z-track in the M31 X-ray Binary RX J0042.6+4115

Details Tracing a Z-track in the M31 X-ray Binary RX J0042.6+4115 Tracing a Z-track in the M31 X-ray Binary RX J0042.6+4115

2003-09-26

arxiv.org/abs/astro-ph/0309726v1

Astron.Astrophys.411:553-558,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A, 6 pages, 5 figures

Scientific paper

10.1051/0004-6361:20031513

Four XMM-Newton observations of the core of M31, spaced at 6 month intervals, show that the brightest point X-ray source, RX J0042.6+4115, has a 0.4-10 keV luminosity of ~5 10^38 erg/s, and exhibits significant variability in intensity and X-ray spectrum over a time scale of ~100 s including hard flares; such behaviour is only observed in Z-sources and transient blackhole binaries in our Galaxy. The lightcurves, X-ray spectra and hardness-intensity data from the four XMM-Newton observations all strongly suggest that it is a Z-source, bringing the total number of known Z-sources to nine.

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