A dataset provided by the European Space Agency

Name 060580
Title Tightly constraining the Timescale-Mass-Accretion rate relationship in AGN


DOI https://doi.org/10.5270/esa-0lfal8y
Author Prof Ian McHardy
Description We have previously shown that AGN have a characteristic time-scale, Tb , which scales roughly as Mmdot (ie mass-accretion rate in Eddington units). However the range of M and mdot covered is not large and hence the dependency on mdot could vary between virgulmdot^(-0.6) and mdot^(-1.3) (90% confidence), with similar mass uncertainties. Understanding this scaling relationship is crucial to our understanding of the accretion process. Therefore, particularly as some researchers have questioned any dependence on mdot, it is crucial to reduce the uncertainties by a factor of 2. The best way to do that is to add one orbit of XMM observations to existing RXTE monitoring to determine Tb in 2 extreme AGN, one with mdot x10 lower, and 1 with mass x10 higher, than previously observed.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2009-11-11T21:05:46Z/2009-12-11T08:04:07Z
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 2011-01-13T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2011-01-13T00:00:00Z, 060580, 17.56_20190403_1200. https://doi.org/10.5270/esa-0lfal8y