|Title||FOSSIL GROUPS - AN EMERGING CLASS OF MASS CONCENTRATIONS|
|Author||Dr CHRISTOPHER MULLIS|
|Description||Recent discoveries hint to the existence of a population of unusual mass concentrations called "fossil groups". Their commonness is likely underestimated due to biases in the optical and the reluctance to recognize new classes of objects. Proposed here are detailed observations of two new fossil groups selected from a statistically complete X-ray survey. We seek to confirm the group-like nature of the X-ray emission thus validating their classification as fossil groups. With positive results we will place more stringent limits on the spatial density of these objects. We will measure accurate luminosities, temperatures, and mass profiles. This will facilitate a comparison to normal groups and an investigation of the formation processes for fossil groups.|
|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, 2005-07-01T00:00:00Z, 020532, 17.56_20190403_1200. https://doi.org/10.5270/esa-k1oebt8|