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Science 5 September 1997:
Vol. 277. no. 5331, pp. 1488 - 1491
DOI: 10.1126/science.277.5331.1488
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Reports
Detection of Soft X-rays and a Sensitive Search for Noble Gases in Comet Hale-Bopp (C/1995 O1)
Vladimir A. Krasnopolsky,
*
Michael J. Mumma,
Mark Abbott,
Brian C. Flynn,
Karen J. Meech,
Donald K. Yeomans,
Paul D. Feldman,
Cristiano B. Cosmovici
An image of comet Hale-Bopp (C/1995 O1) in soft x-rays reveals a
central emission offset from the nucleus, as well as an extended emission feature that does not correlate with the dust jets seen at
optical wavelengths. Neon was found to be depleted in the cometary ice
by more than a factor of 25 relative to solar abundance, which suggests
that ices in Hale-Bopp formed at (or later experienced) temperatures
higher than 25 kelvin. A helium line emission at a wavelength of 584 angstroms was detected and may be attributable to charge transfer of
solar wind  particles in the cometary coma. Ionized oxygen and
another helium line contribute to an emission observed at 538 angstroms.
V. A. Krasnopolsky, Catholic University of America,
Washington, DC 20064, USA, and NASA Goddard Space Flight Center,
Greenbelt, MD 20771, USA.
M. J. Mumma, NASA Goddard Space Flight Center, Greenbelt, MD
20771, USA.
M. Abbott and B. C. Flynn, Center for Extreme Ultraviolet
Astrophysics, Berkeley, CA 94720, USA.
K. J. Meech, Institute for Astronomy, Honolulu, HI 96822, USA.
D. K. Yeomans, Jet Propulsion Laboratory, Pasadena, CA 91109, USA.
P. D. Feldman, Johns Hopkins University, Baltimore, MD 21218, USA.
C. B. Cosmovici, Istituto Fisica Spazio Interplanetario, CNR,
00044 Frascati, Italy.
*
To whom correspondence should be addressed (at NASA). E-mail:
ys2VK{at}lepvax.gsfc.nasa.gov
Read the Full Text
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Organic Composition of C/1999 S4 (LINEAR): A Comet Formed Near Jupiter?.
- M. J. Mumma, N. Dello Russo, M. A. DiSanti, K. Magee-Sauer, R. E. Novak, S. Brittain, T. Rettig, I. S. McLean, D. C. Reuter, and L.-H. Xu (2001)
Science
292, 1334-1339
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- Charge Exchange-Induced X-Ray Emission from Comet C/1999 S4 (LINEAR).
- C. M. Lisse, D. J. Christian, K. Dennerl, K. J. Meech, R. Petre, H. A. Weaver, and S. J. Wolk (2001)
Science
292, 1343-1348
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- Deuterium in Comet C/1995 O1 (Hale-Bopp): Detection of DCN.
- R. Meier, T. C. Owen, D. C. Jewitt, H. E. Matthews, M. Senay, N. Biver, D. Bockelée-Morvan, J. Crovisier, and D. Gautier (1998)
Science
279, 1707-1710
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