|Title||Cosmology with z>3 quasars|
|Author||Prof Guido Risaliti|
|Description||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 ~0.2~dex. This allows to build a Hubble Diagram for quasars up to z~6, opening a new window of observational cosmology at high redshift. Here we propose to observe a sample of 30 quasars at z~3, in order to estimate the ratio of the expansion of the Universe at z=3 and z~0.5 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||The most luminous blue quasars at 3.0 < z < 3.3. I. A tale of two X-ray populations . Nardini, E., Lusso, E., et all. . A&A . 632-109 . 2019 . 2019A&A...632A.109N ,
The WISSH quasars project. VII. The impact of extreme radiative field in the accretion disc and X-ray corona interplay . Zappacosta, L., Piconcelli, E., et all. . A&A . 635-5 . 2020 . 2020A&A...635L...5Z ,
|Instrument||EPN, RGS1, OM, RGS2, EMOS1, EMOS2|
|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, 2019-05-04T22:00:00Z, 080395, 17.56_20190403_1200. https://doi.org/10.5270/esa-ccz11ug|