We propose follow-up observations of three galaxy clusters containingultra-steep spectrum (USS) radio relic sources that have existing low-frequencyGMRT observations. Comparing the morphology and thermal structure of the ICM tothe diffuse radio emission will allow constraints to be placed on the nature ofthese relatively poorly studied sources. For example, a correlation betweenmerger shocks and radio emission implies direct shock acceleration, as withclassical radio relics, whereas a lack of correlation in a disturbed systemsuggests acceleration of an existing particle population by adiabaticcompression.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2018-04-20T20:52:21Z/2018-08-13T07:06:41Z
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 Scott Randall, 2019, 'Understanding the Nature and Environment of Ultra-Steep Spectrum Radio Relics', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-uogus5s
