A dataset provided by the European Space Agency

Name 080508


DOI 10.5270/esa-ee6vbby
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 X-ray reverberation lags from the 1.5 Seyfert galaxy NGC 5273 . Vincentelli, F. M., Mastroserio, G., et all. . MNRAS . 492-1135 . 2020 . 2020MNRAS.492.1135V ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2017-06-02T20:43:18Z/2017-06-05T15:21:18Z
Version 17.56_20190403_1200
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.
Creator Contact https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Date Published 2018-06-29T22:00:00Z
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