We propose to re-observe the four most morphologically disturbed clusters in theREXCESS sample. Our aim is to measure the temperature at R_500 and improve thespatial resolution of the temperature profiles in the flat surface brightnesscentral regions, in order to have measurements of similar quality to thatavailable for relaxed systems. With these data we will precisely measure the HEmass profiles, to test the hypothesis that unrelaxed systems have lessconcentrated mass distributions, a critical test of the dark matter collapse. Wewill also dramatically improve measurements of the entropy in the centralregions, to provide a critical benchmark for numerical simulations.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2010-05-12T07:36:57Z/2011-04-10T21:51:15Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis.
European Space Agency, Dr Gabriel Pratt, 2012, 'Mass and entropy in the most dynamically disturbed REXCESS clusters', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-q9zaj1f
