Excitation of X rays in Comet Hyakutake (C/1996 B2)

Details Excitation of X rays in Comet Hyakutake (C/1996 B2) Excitation of X rays in Comet Hyakutake (C/1996 B2)

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.2069k&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 2069

Physics

9

Comets, X Ray Spectra, Bremsstrahlung, Electron Impact, Rosat Mission, Line Spectra, Satellite Imagery, Cameras, Power Series, Extreme Ultraviolet Radiation, Emission Spectra

Scientific paper

There is great disagreement between current evaluations of the role of bremsstrahlung and line excitation by electron impact and recombination in cometary X-rays. To study the problem in detail, we use the exact values of the ROSAT high-resolution imager and wide-field camera instrument response functions and apply them to all nine exposure intervals in the ROSAT observation of Comet Hyakutake to determine X-ray two-parameter power law and thermal bremsstrahlung spectra. The exposure-mean ROSAT spectrum is in excellent agreement with the EUVE observation of 7.5 x 10 exp 24 ph/s in a range of 100-165 eV from Comet Hyakutake. We follow the same methods as Northrop et al. (1997) to calculate a volume emission rate at the comet brightness maximum and to calculate that from bremsstrahlung with the Vega 2 electron flux. The calculations show that the expected effects of bremsstrahlung and electron impact are very low in cometary X rays.

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