|Title||What is the nature of BAL quasars|
|Author||Dr Bernd Aschenbach|
|Description||GT-About 10-15% of optically selected QSO have optical-UV spectra showing deep, wide absorption troughs, displayed to the blue of their corresponding emission lines. The X-ray properties of BALQSOs as a class are unknown. In a study of BALQSOs from publicly available ROSAT data mainly upper limits were found. This implies that the objects are either highly absorbed, intrinsically underluminous in X-rays, or both.|
|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, 2002-07-23T00:00:00Z, 010044, 17.56_20190403_1200. https://doi.org/10.5270/esa-8564fwo|