Charge exchange-induced X-ray emission from comet C/1999 S4 (LINEAR)

被引：136

作者：

Lisse, CM ^{[1
]}

Christian, DJ

Dennerl, K

Meech, KJ

Petre, R

Weaver, HA

Wolk, SJ

机构：

[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[2] Comp Sci Corp, Sci Operat, Baltimore, MD 21218 USA

[3] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany

[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[7] Harvard Smithsonian Ctr Astrophys, Chandra Xray Ctr, Cambridge, MA 02138 USA

来源：

SCIENCE | 2001年 / 292卷 / 5520期

关键词：

D O I：

10.1126/science.292.5520.1343

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Using soft x-ray observations of the bright new comet C/1999 S4 (LIN EAR) with the Chandra x-ray observatory, we have detected x-ray line emission created by charge exchange between highly ionized solar wind minor ions and neutral gases in the comet's coma. The emission morphology was symmetrically crescent shaped and extended out to 300,000 kilometers from the nucleus. The emission spectrum contains 6 lines at 320, 400, 490, 560, 600, and 670 electron volts, attributable to electron capture and radiative deexcitation by the solar wind species C+5, C+6, N+7, O+7, and O+8. A contemporaneous T-day soft x-ray Light curve obtained using the Extreme Ultraviolet Explorer demonstrates a large increase in the comet's emission coincident with a strong solar flare on 14 and 15 July 2000.

引用

页码：1343 / 1348

页数：6

共 34 条

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