Using XMM-Newton we have observed 1H 0707--495 and find a drop in flux by afactor of more than 2 at a rest-frame energy of virgul7keV without any detectablenarrow Fe K-alpha line emission. The energy of this feature suggests a connec-tion with the neutral iron K photoelectric edge, but the lack of any obviousabsorption in the spectrum at lower energies makes the interpretation challeng-ing. We explore two alternative explanations for this unusual spectral feature:1. partial covering absorption by clouds of neutral material and 2. ionised discreflection with lines and edges blurred together by relativistic effects. Thelimited statistics mean that the identification of the feature remains ambiguousand requires the obseravation length to be increased by a factor of 4.
Instrument
EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage
2002-10-13T11:10:37Z/2002-10-14T09:23:10Z
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 Thomas Boller, 2003, 'The physical nature of the sharp spectral featue at 7 keV detected in 1H0707-495', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-s983suy
