|Title||THE HIGH-ENERGY CUT-OFF IN HIGH-Z-HIGH-L QSOS|
|Author||Dr Giorgio Lanzuisi|
|Description||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 total time request is 320k NuSTAR and 70ks XMM. By looking at rest-frame energies up to 300 keV, our goal is to measure unambiguously the presence of spectral cut-offs at rest-frame energies up to E c=500 keV. This is not possible for local targets, where NuSTAR is just sensitive to E c<250 keV. The two brightest sources of a sample of four have been successfully observed in Cycle 3. These observations allowed to measure for the first time E c in distant, luminous QSOs. The proposed observations will allow to build a a small but unique sample of high-z, high-LX QSOs with accurate Ec measurements, to test current coronal models.|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2020-05-20T22:00:00Z, 083048, 17.56_20190403_1200. https://doi.org/10.5270/esa-2cg9cxd|