GT-CL0939+4713 at z=0.41 is an extremely rich, distant cluster of galaxies,possibly the richest cluster known. At the same time it is one of the opticallybest studied galaxy clusters at high redshift. As the cluster is extremely richin the optical it is of preeminent interest to find out whether the total massof the cluster is extraordinarily high as well: very massive clusters at highredshifts are a challenge for most cosmological models. The deficiency of metalstogether with the high galaxy content is a puzzle. The study of the deficiencyof metals and their distribution will give information on the process of clusterformation. Furthermore, there are two other interesting sources in the pointing:a strongly variable, unknown source and a quasar at z=2.055
Instrument
EMOS1, EMOS2, EPN, OM
Temporal Coverage
2000-11-06T14:44:19Z/2000-11-07T06:15:31Z
Version
17.56_20190403_1200
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, Dr Bernd Aschenbach, 2000, 'The optically rich and young cluster Cl0939+472', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-tp1wv70
