H2 excitation by magnetic shock precursors in the Cygnus Loop supernova remnant

Details H2 excitation by magnetic shock precursors in the Cygnus Loop supernova remnant H2 excitation by magnetic shock precursors in the Cygnus Loop supernova remnant

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..175g&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 175-184.

Astronomy and Astrophysics

Astronomy

34

Hydrogen, Molecular Excitation, Shock Waves, Supernova Remnants, Cygnus Constellation, Emission Spectra, Stellar Magnetic Fields, Stellar Models

Scientific paper

Emission from vibrationally excited H2 has been discovered which is associated with the bright optical shock-excited filaments to the northeast of the Cygnus Loop supernova remnant. Infrared spectroscopy and infrared and optical narrow-band images of the shock-excited gas have been obtained in an effort to understand the mechanism of H2 excitation. A shock model with a magnetic precursor is proposed which explains quantitatively the observed H2 surface brightness, level population, and relation to optical emission. A shock with a magnetic precursor can also account for some of the anomalous properties of nonradiative shocks.

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