We will observe 3 candidate fossil groups identified using SDSS and RASS. Thedozen previously known fossil groups show normal X-ray group properties, buthave optical properties that are dominated by a bright central galaxy. Theformation of such systems is not understood, although various mechanisms havebeen suggested. We will measure the luminosities, surface brightnesses, andradial temperature profiles and correlate with the optical data. Some of thesesystems show an excess X-ray luminosity (with respect to their temperatures oroptical properties) which could be explained by cooling, entropy, or inefficientstar-formation. By combining with N-body/Hydro simulations, we will learn abouttheir abundances and formation mechanisms.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2006-06-10T08:14:37Z/2006-08-10T18:32:25Z
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 Christopher Miller, 2007, 'A Systematic Study of Fossil Groups', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-i8ywa9w
