We propose XMM-Newton observations of the persistent low-mass X-ray binary 4U1957+11. This source, which probably contains a black hole primary, is viewed ata high inclination, which allows for a detailed study of the accretion flow. Ouraim is to study the geometry and properties of the accretion disk and itsextended corona, both on small and large scales, by means of emission andabsorption line features. Moreover, combined with simultaneous RXTE obser-vations (which we have been awarded) we will study the broad band spectrum andvariability in great detail and put stringent constraints on the presence of aneutron star in this system. Finally, we will search for large scale jets likethose recently found in 4U 1755-33, a source very similar to 4U 1957+11.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2004-10-16T00:10:22Z/2004-10-16T12:39:00Z
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 JEROEN HOMAN, 2005, '4U 1957+11: A POSSIBLE BLACK HOLE ACCRETION DISK CORONA SOURCE', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-yzavy5e
