We propose the first useful XMM observation of the CLASH cluster Abell 611. Wehave imaged the Sunyaev-Zel.dovich (SZ) effect using MUSTANG (9 res) andBolocam (1. res). The high resolution MUSTANG SZ image shows an excess south ofthe cluster center that is likely to be a merger shock. The MUSTANG+Bolocamimage was used to derive the cluster pressure profile, which is 3x greater thanthat from the Chandra X-ray data. This is the largest discrepancy seen in anyclusters we have observed. We will use the XMM observation to establish thenature of the southern SZ excess, and determine the dynamical state of thecluster. The origin of the SZ vs. X-ray discrepancy will be found; this isimportant as a test of X-ray or SZ mass proxies for clusters in cosmological studies.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2017-04-19T23:45:49Z/2017-04-26T05:24:45Z
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, Prof Craig Sarazin, 2018, 'Merger Shocks and the Origin of the Large X-ray vs. SZ Discrepancy in Abell 611', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-5jf2k8a
