We have recently shown that the non-linear correlation between X-ray and UV emission in quasars can be used to estimate quasar distances with a precision of virgul0.2virguldex. This allows to build a Hubble Diagram for quasars up to zvirgul6, opening a new window of observational cosmology at high redshift. Here we propose to observe a sample of 30 quasars at zvirgul3, in order to estimate the ratio of the expansion of the Universe at z=3 and zvirgul0.5 with a 10% precision, enough for a tight test of the standard cosmological model, and to improve the current constraints on the possible evolution of the equation of state of dark energy.
Publication
No observations found associated with the current proposal
Instrument
EPN, RGS1, OM, RGS2, EMOS1, EMOS2
Temporal Coverage
2017-04-12T04:03:35Z/2018-04-14T12:15:22Z
Version
17.56_20190403_1200
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.
