|Title||Understanding Projection Effects in Dark Energy Survey Cluster Selection|
|Author||Prof Tesla Jeltema|
|Description||Clusters of galaxies in optical imaging surveys like the DES have the statistical power to be the single most constraining probe of dark energy. However, realizing this potential relies on our ability to control for systematics, the largest remaining of which are the effects of projection on cluster selection and mass determinations. We propose XMM observations of six DES clusters where existing spectroscopy indicates a significant contamination from projection-correlated structure resulting in high velocity dispersions for their richness. These data, along with existing data for an additional five clusters, will allow us to understand the origin of this population (truly massive clusters, low mass clusters, unvirialized projections) and their contribution to the DES cluster catalog.|
|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, 2022-01-27T00:00:00Z, 086091, 18.02_20200221_1200. https://doi.org/esa-[xxxxxxx]|