We propose NuSTAR observations of two bright (FX>5 10^-13 cgs, LX>10^46 erg/s)radio-quiet QSOs at z>2, plus short XMM exposures for each of them: our totaltime request is 320k NuSTAR and 70ks XMM. By looking at rest-frame energies upto 300 keV, our goal is to measure unambiguously the presence of spectralcut-offs at rest-frame energies up to E c=500 keV. This is not possible forlocal targets, where NuSTAR is just sensitive to E c<250 keV. The two brightestsources of a sample of four have been successfully observed in Cycle 3. Theseobservations allowed to measure for the first time E c in distant, luminousQSOs. The proposed observations will allow to build a a small but unique sampleof high-z, high-LX QSOs with accurate Ec measurements, to test current coronal models.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2019-01-14T11:07:23Z/2019-04-24T07:00:23Z
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.
European Space Agency, Dr Giorgio Lanzuisi, 2020, 'THE HIGH-ENERGY CUT-OFF IN HIGH-Z/HIGH-L QSOS', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-2cg9cxd
