|Title||A link between X-ray weakness and Eddington ratio in BALQSOs?|
|Author||Dr Fabio Vito|
|Description||We found hints of an anti-correlation between observed X-ray weakness and Eddington ratio in a small sample of BALQSOs observed in the X-rays with high- quality black hole mass estimates. We argue that this could be due to intervening obscuration (perhaps due to the presence of a "failed wind" at the base of the accretion disk, as requested by some model of wind launching in BALQSOs) or to intrinsic (i.e. not due to absorption) X-ray weakness, sometimes associated with rapidly-accreting SMBH. In order to assess if that anti-correlation exists and to test the different possible physical explanations, we propose to observe with XMM-Newton a sample of 8 BALQSOs at z=1.7-1.9, for a total of 147 ks.|
|Publication||No evidence for an Eddington-ratio dependence of X-ray weakness in BALQSOs . Vito, F., Brandt, W. N., et all. . MNRAS . 479-5335 . 2018 . 2018MNRAS.479.5335V ,
|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, 2018-08-01T22:00:00Z, 080179, 17.56_20190403_1200. https://doi.org/10.5270/esa-3c6eajk|