| Name | 080508 |
| Title | X-RAY-UV-OPTICAL REVERBERATION MAPPING OF LOW MASS AGN |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0805080401 |
| DOI | https://doi.org/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 | No observations found associated with the current proposal |
| 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, Prof Ian McHardy, 2018, 080508, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ee6vbby |