|A CHANGING INNER RADIUS IN THE ACCRETION DISC OF Q0056-363 ?
|Prof Giorgio Matt
|0056-363 was observed twice with XMM- Newton , in 2000 and 2003. In the second observation, the soft X-ray emission was less prominent, the UV flux lower, the hard X-ray emission flatter, and the iron line much less intense than in the first observation. These changes are consistent with a scenario in which the inner disc radius changed between the two observations, being close to the innermost stable orbit in the first observation, while the disc was truncated at a larger radius in the second observation. We propose to observe Q0056-363 again, twice (once per visibility window), for 40 ks each, to confirm or rule out the .changing inner radius. scenario, and to further study the rather extreme spectral evolution of this source.
|No observations found associated with the current proposal
|EMOS1, EMOS2, EPN, OM, RGS1, RGS2
|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.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2007, 040193, 17.56_20190403_1200. https://doi.org/10.5270/esa-wzszfpu