| Proposal ID | 084497 |
| Title | High-redshift quasars: Cosmology and Physics |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0844970601 |
| DOI | https://doi.org/10.57780/esa-mio13nd |
| Principal Investigator, PI | Dr Elisabeta Lusso |
| Abstract | The non-linear X-ray/UV relation in quasars can be used to build a Hubblediagram and test cosmological models at high redshift. To this aim, we wereawarded an XMM LP to observe 30 bright quasars at z~3. We found a tighter-than-expected X-ray/UV relation, implying that pointed observations can greatlyreduce the uncertainties in the determination of quasar distances, and a newpopulation of X-ray weak quasars that represents ~30% of the z~3 sample. Wepropose an extensive survey of bright, radio-quiet, SDSS quasars at z~4 with thegoals of (1) detecting a 4sigma deviation from the LambdaCDM model using thisz~4 sample alone, (2) measuring the X-ray weak fraction of quasars for the firsttime at z~4 and its evolution with time. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2020-03-29T22:57:55Z/2020-03-30T19:14:35Z |
| Version | 18.02_20200221_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 | 2021-04-16T00:00:00Z |
| Last Update | 2025-01-27 |
| Keywords | "linear xray", "greatly reduce", "xray weak fraction", "uv relation", "SDSS", "test cosmological models", "quasar distances", "sdss quasars", "lambdacdm model", "radio quiet", "hubble diagram", "XMM", "bright quasars", "extensive survey", "4sigma deviation", "xray weak quasars", "xmm lp" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Elisabeta Lusso, 2021, 'High-redshift quasars: Cosmology and Physics', 18.02_20200221_1200, European Space Agency, https://doi.org/10.57780/esa-mio13nd |