| Name | 060580 |
| Title | Tightly constraining the Timescale-Mass-Accretion rate relationship in AGN |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0605800301 |
| 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 |