Extreme Non-LTE H2 in Comets C/2000 WM1 (LINEAR) and C/2001 A2 (LINEAR)

Details Extreme Non-LTE H2 in Comets C/2000 WM1 (LINEAR) and C/2001 A2 (LINEAR) Extreme Non-LTE H2 in Comets C/2000 WM1 (LINEAR) and C/2001 A2 (LINEAR)

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apjs..169..458l&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 169, Issue 2, pp. 458-471.

Astronomy and Astrophysics

Astronomy

4

Comets: General, Comets: Individual: Alphanumeric: C/2000 Wm1, Comets: Individual: Alphanumeric: C/2001 A2, Molecular Processes, Ultraviolet: Solar System

Scientific paper

Rotationally resolved molecular hydrogen transitions originating from excitation of highly excited rovibrational levels of the X 1Σ+g state have been systematically identified for the first time in the Far Ultraviolet Spectroscopic Explorer (FUSE) observation of comets C/2000 WM1 (LINEAR) and C/2001 A2 (LINEAR). Spectral assignments for the observed lines of H2 and other atomic and molecular species are given. All observed H2 transitions belong to the Lyman (B 1Σ+u-X 1Σ+g) and Werner (C 1Πu-X 1Σ+g) band systems. Solar Lyα fluorescence excitation of highly rovibrationally excited H2 X 1Σ+g is found to be almost solely responsible for the observed H 2 emission. Resonant excitation of H2 by Lyβ and other solar lines is very limited.

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