|Title||X-RAY PROPERTIES OF A MASS-SELECTED GROUP CATALOG|
|Author||Dr PASQUALE MAZZOTTA|
|Description||The observed X-ray luminosities of groups are inconsistent with a model in which the intragroup medium is shock-heated during the collapse. It is thought that a combination of pre-heating, gas cooling and energy injection removes low entropy gas, reducing the system.s X-ray luminosity. However, the extent of this process is uncertain because the previous selection of group catalogs has been based on X-ray emission. We have constructed a complete, mass-selected catalog of groups from the 2dFGRS. X-ray observations of this sample would for the first time provide accurate determinations of the entropy in a mass-selected sample. These observations are of key importance for understanding the thermal history of the intragroup medium and the interplay between X-ray cooling and galaxy formation.|
|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, 2006-07-08T00:00:00Z, 020175, 17.56_20190403_1200. https://doi.org/10.5270/esa-a4lnkca|