Observational limits on SH(+) in diffuse clouds and the possible detection of NI I in the ISM

Details Observational limits on SH(+) in diffuse clouds and the possible detection of NI I in the ISM Observational limits on SH(+) in diffuse clouds and the possible detection of NI I in the ISM

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1429m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1429-1434.

Astronomy and Astrophysics

Astronomy

11

Interstellar Matter, Molecular Clouds, Molecular Ions, Nickel, Sulfur Compounds, Absorption Spectra, Early Stars, Electron Transitions, Interstellar Gas, Magnetohydrodynamics

Scientific paper

The 3350-3400-A spectral range has been observed in the direction of 13 early type stars behind diffuse molecular clouds. Although no lines from transitions in the (0-0) band of SH(+) have been detected, the upper limits to the column density of SH(+) are an improvement over previous searches and indicate the absence of strong MHD shocks at least along the observed line of sight. A series of weak lines have been tentatively identified in the composite spectrum as arising from the two lowest terms of neutral nickel in the ISM.

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