Do the W44 and W28 molecular clouds show evidence of a shock

Details Do the W44 and W28 molecular clouds show evidence of a shock Do the W44 and W28 molecular clouds show evidence of a shock

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...264..141d&link_type=abstract

Astrophysical Journal, Part 1, vol. 264, Jan. 1, 1983, p. 141-151.

Astronomy and Astrophysics

Astrophysics

27

H Lines, Hydroxyl Emission, Molecular Clouds, Shock Waves, Supernova Remnants, Abundance, Astronomical Maps, Molecular Excitation, Molecular Spectra, Optical Thickness, Spectral Line Width

Scientific paper

OH and H I in the molecular cloud associated with W44 have been mapped, with 3 arcmin resolution. The optical depth maps support a cloud-remnant interaction. The line profiles show a multicomponent structure, which can explain increased line widths adjacent to the remnant without the necessity for shock processing. The OH and H I excitation temperatures are 13 K and 99 K. These values do not exclude the possibility of shock interaction. Observations of HCO(+), HCN, CS, N2H(+), OCS, and SO2 in W44 and W28 are presented. There are no abundance enhancements in these molecules, relative to CO. A broad-velocity component of HCO(+), HCN, and CS seen in the W28 cloud may represent shocked material. At present, there is no firm evidence to support shock processing of the molecular clouds adjacent to either remnant.

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