Sensitive XMM-Newton observations of the luminous Sunyaev-Zel.dovich effectcluster CL 0016+16 (z=0.55) have led to considerably improved measurements ofdistance, gas-mass fraction, and Hubble constant, for a cluster at a redshiftwhere curvature of the angular-diameter/redshift relation is particularlyevident. We propose a deep observation of the cluster.s twin, MS 0451.6-0305, toallow similar measurements for this second cluster. Averaging results for thetwo clusters will alleviate the potential problem of systematic errors in thedistance estimate arising from projection effects. The results will also testthe suggestion that the baryonic mass fraction in MS 0451.6-0305 is anomalouslylow, at only about a third the value seen in CL 0016+16.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-09-16T23:52:02Z/2004-09-17T12:13:48Z
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 DIANA WORRALL, 2005, 'COSMOLOGY WITH A SECOND SUNYAEV-ZEL.DOVICH EFFECT CLUSTER AT Z', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ndofawr
