|Title||THE HIGH-ENERGY CUT-OFF IN HIGH-Z QSOS: A FIRST CUT|
|Author||Dr Giorgio Lanzuisi|
|Description||We propose NuSTAR observations of two among the X-ray brightest (F 0.5-10 > 5 10^-13 ergs s^-1 cm^-2, L 2-10 > 10^45 ergs s^-1) radio-quiet QSOs at z > 1.8, complemented by a joint, short XMM-Newton exposure for one of them. Our total time request is 250ks with NuSTAR and 30ks with XMM-Newton. By looking at rest-frame energies up to ~ 200-300 keV, our goal is to measure unambiguously the presence of spectral cut-offs at rest-frame energies as high as E c=500 keV. This is not possible for targets in the local Universe, where NuSTAR is just sensitive to E c < 250 keV. Our sample is unique and will allow unprecedented measurements of E c in distant AGN with such X-ray luminosities. Our program will prove for the first time whether there is a physical limit to the temperature of AGN.|
|Publication||NuSTAR Measurement of Coronal Temperature in Two Luminous, High-redshift Quasars . Lanzuisi, G., Gilli, R., et all. . ApJ . 875-20 . 2019 . 2019ApJ...875L..20L ,
|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, 2019-01-12T23:00:00Z, 079564, 17.56_20190403_1200. https://doi.org/10.5270/esa-dc2hedv|