A dataset provided by the European Space Agency

Name 084497
Title High-redshift quasars: Cosmology and Physics


DOI https://doi.org/esa-[xxxxxxx]
Author Dr Elisabeta Lusso
Description The non-linear X-ray-UV relation in quasars can be used to build a Hubble diagram and test cosmological models at high redshift. To this aim, we were awarded an XMM LP to observe 30 bright quasars at zvirgul3. We found a tighter-than- expected X-ray-UV relation, implying that pointed observations can greatly reduce the uncertainties in the determination of quasar distances, and a new population of X-ray weak quasars that represents virgul30% of the zvirgul3 sample. We propose an extensive survey of bright, radio-quiet, SDSS quasars at zvirgul4 with the goals of (1) detecting a 4sigma deviation from the LambdaCDM model using this zvirgul4 sample alone, (2) measuring the X-ray weak fraction of quasars for the first time at zvirgul4 and its evolution with time.
Publication No observations found associated with the current proposal
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 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 2021-04-16T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2021-04-16T00:00:00Z, 084497, 18.02_20200221_1200. https://doi.org/esa-[xxxxxxx]