|Title||Are fossil groups a challenge of the CDM paradigm?|
|Author||Dr Gabriel Pratt|
|Description||Fossil groups may have up to two orders of magnitude less substructure than predicted in CDM simulations. The significance of this lack of substructure depends on the depth of the galaxy luminosity function and on the mass of the group. We have initiated a project to determine the substructure distribution function (SDF) for the members of a representative sample of 4 REFLEX fossil groups down to M^* + 6 within a large fraction of the infall region. We will obtain X-ray observations of two fossil groups to complete the X-ray sample, to complement the optical observations and to compare with new simulations. We will compare the SDF from optical and X-ray mass estimates with theoretical predictions. We will establish if fossil groups do challenge the CDM paradigm.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2009-01-01T00:00:00Z, 050111, 17.56_20190403_1200. https://doi.org/10.5270/esa-offpf58|