Gravitationally lensed QSOs are powerful tools for measuring cosmologicalparameters if their lens potentials can be adequately constrained. Groups andclusters of galaxies close to the line of sight to multiply lensed QSOscontribute significantly to the potential. Such collapsed mass concentrationscan be traced by X-rays. We here propose to map the mass distribution aroundfour well-constrained quadruple lenses with 0.3 < z < 0.8 and predictedtemperatures 1 keV < kT < 6 keV. The primary aim of these observations will beto constrain the mass models of the lenses, to study the low-mass end of scalingrelations relating mass to X-ray observables and finaly to put constrains on theHubble constant and the cosmological constant.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2001-11-02T02:01:20Z/2001-11-02T07:45:46Z
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 Jens Hjorth, 2002, 'Groups and clusters near multiply lensed QSOs', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-9std489
