X-ray Timing beyond the Rossi X-ray Timing Explorer

Details X-ray Timing beyond the Rossi X-ray Timing Explorer X-ray Timing beyond the Rossi X-ray Timing Explorer

2006-06-05

arxiv.org/abs/astro-ph/0606085v1

Astronomy and Astrophysics

Astrophysics

12 pages, 6 figures, COSPAR Colloquium "Spectra & Timing of Compact X-ray Binaries", January 17-20, 2005, Mumbai, India. Advan

Scientific paper

10.1016/j.asr.2005.10.051

With its ability to look at bright galactic X-ray sources with sub-millisecond time resolution, the Rossi X-ray Timing Explorer (RXTE) discovered that the X-ray emission from accreting compact stars shows quasi-periodic oscillations on the dynamical timescales of the strong field region. RXTE showed also that waveform fitting of the oscillations resulting from hot spots at the surface of rapidly rotating neutron stars constrain their masses and radii. These two breakthroughs suddenly opened up a new window on fundamental physics, by providing new insights on strong gravity and dense matter. Building upon the RXTE legacy, in the Cosmic Vision exercise, testing General Relativity in the strong field limit and constraining the equation of state of dense matter were recognized recently as key goals to be pursued in the ESA science program for the years 2015-2025. This in turn identified the need for a large (10 m2 class) aperture X-ray observatory. In recognition of this need, the XEUS mission concept which has evolved into a single launch L2 formation flying mission will have a fast timing instrument in the focal plane. In this paper I will outline the unique science that will be addressed with fast X-ray timing on XEUS.

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