|Title||Groups and clusters near multiply lensed QSOs|
|Author||Dr Jens Hjorth|
|Description||Gravitationally lensed QSOs are powerful tools for measuring cosmological parameters if their lens potentials can be adequately constrained. Groups and clusters of galaxies close to the line of sight to multiply lensed QSOs contribute significantly to the potential. Such collapsed mass concentrations can be traced by X-rays. We here propose to map the mass distribution around four well-constrained quadruple lenses with 0.3 < z < 0.8 and predicted temperatures 1 keV < kT < 6 keV. The primary aim of these observations will be to constrain the mass models of the lenses, to study the low-mass end of scaling relations relating mass to X-ray observables and finaly to put constrains on the Hubble constant and the cosmological constant.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|Mission Description||The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2002-11-23T00:00:00Z, 008324, 17.56_20190403_1200. https://doi.org/10.5270/esa-9std489|