The impact of projection effects on optical, photometric galaxy clusterselection has recently been clarified at z virgul 0.1 using extensive spectroscopy ofputative member galaxies. The projected fraction of photometrically associatedgalaxies has been constrained as a function of richness, along with therelations between photometric and spectroscopically-corrected richness andvelocity dispersion. We propose XMM-Newton observations of a complete sub-sampleof these clusters at high richness to obtain low-scatter X-ray mass proxies.These measurements will provide independent, complementary information onprojection effects and, crucially, will allow the scatter ofspectroscopically-corrected richness with mass to be quantified.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2022-06-05T03:38:43Z/2022-11-07T21:15:40Z
Version
20.09_20221024_1724
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, Mr Justin Myles, 2023, 'Measuring Projection Effects in Optical Cluster Catalogues', 20.09_20221024_1724, European Space Agency, https://doi.org/10.57780/esa-70k0l4c
