|Title||X-RAY-UV-OPTICAL REVERBERATION MAPPING OF LOW MASS AGN|
|Author||Prof Ian McHardy|
|Description||Recent Swift observations of 4 medium mass AGN show that UV-optical variations lag higher energies as expected from reprocessing of high energies by an accretion disc. However the measured disc sizes are 3x larger than expected from theory and in 2 AGN the X-rays lead the UV by more than expected. It is also unclear whether earlier poor X-ray-optical correlations in high accretion rate (mdot) AGN are just due to inadequate sampling. We have recently shown that, for low masses, XMM can measure the crucial X-ray-UV lag and correlation strength very simply. Here we request to observe 4 low mass AGN with a range of mdot to measure that crucial lag and, from the ground, also the X-ray-g-band lag, so that the above problems, and any variation with mass or mdot can be properly understood.|
|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, 2018-06-29T22:00:00Z, 080508, 17.56_20190403_1200. https://doi.org/10.5270/esa-ee6vbby|