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Proceedings Paper

A major step in understanding the X-ray generation in comets: recent progress obtained with XMM-Newton
Author(s): Konrad Dennerl; Bernd Aschenbach; Vadim Burwitz; Jakob Englhauser; Casey M. Lisse; Pedro M. Rodriguez-Pascual
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Paper Abstract

The observation of comet C/2000 WM1 (LINEAR) with XMM-Newton is a highlight in the field of cometary research. During 17 hours of almost uninterrupted observations, more than one million photons were recorded with unprecedented spectral resolution. The results obtained so far clearly demonstrate that the X-ray emission is caused by charge exchange reactions between highly charged heavy ions in the solar wind - mainly oxygen and carbon - and cometary gas. Due to the high number of detected photons, an investigation of the X-ray morphology is also possible in considerable detail. The observation was also a highlight from the technological point of view, demonstrating that XMM-Newton has more capabilities than are currently utilized. In order to follow the comet, the orientation of the satellite had to be adjusted several times. This was done by just changing the guide star offsets, leaving the X-ray instruments switched on. Compared to the usual procedure with regular slews, where the X-ray instruments are reinitialized afterwards, this new technique increased the time available for scientific observations by 34% for MOS and by 83% for PN. The capability of performing quick attitude adjustments during an observation may be of interest also for other astrophysical applications.

Paper Details

Date Published: 11 March 2003
PDF: 12 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461137
Show Author Affiliations
Konrad Dennerl, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Bernd Aschenbach, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Vadim Burwitz, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Jakob Englhauser, Max-Planck-Institut fuer extraterrestrische Physik (Germany)
Casey M. Lisse, Univ. of Maryland/College Park (United States)
Pedro M. Rodriguez-Pascual, XMM-Newton SOC (Spain)

Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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