A dataset provided by the European Space Agency

Name 080395
Title Cosmology with z>3 quasars
URL

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DOI 10.5270/esa-ccz11ug
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
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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2019-05-04T22:00:00Z
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