| Proposal ID | 080395 |
| Title | Cosmology with z>3 quasars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0803950101 |
| DOI | https://doi.org/10.5270/esa-ccz11ug |
| Principal Investigator, PI | Prof Guido Risaliti |
| Abstract | 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 of~0.2~dex. This allows to build a Hubble Diagram for quasars up to z~6, opening anew window of observational cosmology at high redshift. Here we propose toobserve a sample of 30 quasars at z~3, in order to estimate the ratio of theexpansion of the Universe at z=3 and z~0.5 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. |
| Publications |
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| 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 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. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2019-05-04T22:00:00Z |
| Last Update | 2026-03-04 |
| Keywords | "uv emission", "linear correlation", "quasar distances", "dark energy", "standard cosmological model", "tight test", "hubble diagram" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | 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 |