XMM observations of Her X-1

Details XMM observations of Her X-1 XMM observations of Her X-1

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.1286z&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

We present the results of a series of XMM-Newton observations of Her X-1, spread over a wide range of the 35 d precession period. The strong fluorescence emission line at ~6.4 keV is detected in all observations (apart from one taken in the middle of eclipse), with higher line energy, width and normalisation during the main-on state. Spin resolved spectroscopy just after the rise to the main-on state shows that the variation of the Fe Kα at 6.4 keV is correlated with the soft X-ray emission. This confirms our past finding based on the XMM-Newton observations made further into the main-on state, and indicates the common origin for the thermal component and the Fe Kα line detected at these phases. We also find that, during the low state, the normalisation of the 6.4keV line is correlated with the binary orbital phase, having a broad maximum centered near ϕorbit ~ 0.5. In addition, we detect a second line near 7 keV in 10 of the 15 observations taken during the low-intensity states of the system. The RGS spectrum taken during the low state shows a series of broad absorption lines and two radiative recombination continuum features. Taken together, these facts strengthen the interpretation of the low state emission in term of an extended source that we identify with a photoionized accretion disk atmosphere and corona.

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