We propose a ToO observation of a transient black-hole candidate, either knownor unknown, during its transition from hard to soft state. This transition,which takes place at high flux levels, encompasses marked changes in theproperties of the accretion flow and it includes the time at which the ejectionof an accelerating relativistic jet stops abruptly. The study of the softspectral component as well as the behaviour of the iron line is important forour understanding of the accretion disc during state transition. We would liketo investigate in particular the process responsible for the disappearance ofthe variability in the soft energy band, which has been detected in the hardstate with XMM-Newton, but is absent in the soft state.
Instrument
EPN, OM, RGS1, RGS2
Temporal Coverage
2014-09-24T18:02:31Z/2014-09-25T08:37:31Z
Version
17.56_20190403_1200
Mission Description
The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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.
European Space Agency, Dr Holger Stiele, 2015, 'Black hole transient during transition from hard to soft state', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-y4igl8o
