We propose a ToO (triggered) observation with XMM-Newton of the atoll source 4U1705-44 during a soft state. A Chandra observation of this source clearlyindicate the presence of a broad (sigma virgul 0.7 keV) iron line. Both arelativistic disc line and a thermal Comptonization broadening fit well the lineprofile. The superior sensitivity at the iron line energy of XMM-Newton isneeded to give a definite answer to the problem of the origin of the broad ironline.
Instrument
EMOS1, EPN, OM, RGS1, RGS2
Temporal Coverage
2008-08-24T01:59:59Z/2008-08-24T17:14:51Z
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 Tiziana Di Salvo, 2009, 'A relativistic iron line in the X-ray spectrum of the atoll source 4U 1705-44questionMark', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-p4chn93
