Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.301w&link_type=abstract
Astronomy and Astrophysics, v.315, p.L301-L304
Astronomy and Astrophysics
Astrophysics
41
Stars: Pre-Main Sequence, Ism: Individual Objects: Cep A, Ism: Jets And Outflows, Ism: Molecules, Infrared: Ism: Lines And Bands
Scientific paper
The Herbig-Haro complex GGD37 is an active region in the west of Cepheus A. We have used the ISO Short Wavelength Spectrometer (SWS) to investigate the physics of this region by observations of molecular hydrogen and forbidden atomic and ionic emission lines over a wide wavelength and excitation energy range. We find excitation temperatures of the emitting molecular gas to be between 700 and 11000 K, the former being thermal in nature, whilst the latter implies a contribution from non-thermal processes. Gas densities in the emitting region are at least 10^5^cm^-3^. An H_2_ ortho-to-para ratio of 3, equal to the ratio of statistical weights, is consistent with our observations. The forbidden transitions can be modelled by a planar J-shock with pre-shock density of 10^3^ to 10^4^cm^-3^ and velocity 70 to 80 km/s. The H_2_ lines cannot be fit by either a single planar J- or C-shock, but instead require a combination of at least two C-shocks with different pre-shock density, shock velocity and covering factor.
de Graauw Th.
Drapatz Siegfried
Katterloher Reinhard
Timmermann Ralf
van der Werf Paul P.
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