X-ray emissions from comets detected in the Röntgen X-ray satellite all-sky survey.

Details X-ray emissions from comets detected in the Röntgen X-ray satellite all-sky survey. X-ray emissions from comets detected in the Röntgen X-ray satellite all-sky survey.

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sci...277.1625d&link_type=abstract

Science, Vol. 277, No. 5332, p. 1625 - 1630

Physics

84

Comets: X Rays

Scientific paper

After the unexpected discovery of X-rays emitted from comet C/1996 B2 (Hyakutake) with the Röntgen X-ray Satellite (ROSAT) in March 1996, X-ray emissions from comets C/1990 K1 (Levy), C/1990 N1 (Tsuchiya-Kiuchi), 45P (Honda-Mrkos-Pajdusakova), and C/1991 A2 (Arai), optically 300 to 30000 times fainter than Hyakutake, were discovered in archival ROSAT data. These findings establish comets as a class of X-ray sources and allow their properties to be studied over a wide optical brightness range. The results indicate that charge exchange between highly charged heavy ions in the solar wind and cometary neutrals is the dominant process for the X-ray emission. Comets may thus be used as probes for monitoring the heavy-ion content of the solar wind.

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