Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..21g&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 1, 1991, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
9
Hydrogen, Infrared Spectra, Interstellar Gas, Line Spectra, Nebulae, Supernova Remnants, Astronomical Spectroscopy, Emission Spectra, Fabry-Perot Interferometers, H Alpha Line, Herbig-Haro Objects, Shock Waves, Star Formation
Scientific paper
Infrared Fabry-Perot spectra at 25 km/s resolution have been obtained for the H2 line emission associated with the fast shocks to the NE of the Cygnus Loop supernova remnant. Profiles of the 1-0 S(1) H2 emission associated with both the optically bright radiative shocks and the faint nonradiative shocks have been observed. The profiles are resolved and have deconvolved widths of 20 km/s. This result favors excitation of the H2 emission in a magnetic precursor over excitation by a radiative precursor. Shocks with precursors may play an important role in Herbig-Haro objects, and in star-forming cloud cores.
Geballe Thomas Ronald
Graham James R.
Wright Gillian S.
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