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 zvirgul3. 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 virgul30% of the zvirgul3 sample. Wepropose an extensive survey of bright, radio-quiet, SDSS quasars at zvirgul4 with thegoals of (1) detecting a 4sigma deviation from the LambdaCDM model using thiszvirgul4 sample alone, (2) measuring the X-ray weak fraction of quasars for the firsttime at zvirgul4 and its evolution with time.
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.
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
