We have recently shown that the non-linear correlation between X-ray and UVemission in quasars can be used to estimate quasar distances with a precision ofvirgul0.2virguldex. This allows to build a Hubble Diagram for quasars up to zvirgul6, opening anew window of observational cosmology at high redshift. Here we propose toobserve a sample of 30 quasars at zvirgul3, in order to estimate the ratio of theexpansion of the Universe at z=3 and zvirgul0.5 with a 10% precision, enough for atight test of the standard cosmological model, and to improve the currentconstraints on the possible evolution of the equation of state of dark energy.
Instrument
RGS1, EPN, RGS2, EMOS1, OM, EMOS2
Temporal Coverage
2017-04-12T04:03:35Z/2018-04-14T12:15:22Z
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 Guido Risaliti, 2019, 'Cosmology with z>3 quasars', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ccz11ug
