|Title||Shedding light on the X-ray weakness of the most luminous quasars|
|Author||Dr Luca Zappacosta|
|Description||In our WISE-SDSS-selected sample of hyperluminous (Lbol > 10^47 erg-s) quasars (WISSH) we are finding a sizable fraction of sources with strongly blueshifted CIV emission lines (v_civ < -2000 km-s) and up to 1.5 dex lower X-ray luminosity (L_X) compared to that reported for normal quasars. Based on a sub-sample of 13 sources, we find that L_X and v_civ significantly correlate. No relation is found at other bands. Furthermore, at low L_X, our constraints on Gamma and N_H are insufficient to verify a dependence on v_CIV. We propose for XMM observations to perform a complete X-ray coverage for the remaining 9 WISSH QSOs with measured v_civ. These will allow a refined investigation enabling us to discriminate between competing models for the origin of these sources.|
|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, 2022-01-31T00:00:00Z, 086521, 18.02_20200221_1200. https://doi.org/10.57780/esa-citsu3t|