A search for interstellar NaH and MgH in diffuse clouds

Details A search for interstellar NaH and MgH in diffuse clouds A search for interstellar NaH and MgH in diffuse clouds

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..155c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 155-158.

Astronomy and Astrophysics

Astrophysics

10

Astronomical Spectroscopy, Density Distribution, Interstellar Matter, Magnesium Compounds, Molecular Clouds, Sodium Hydrides, Absorption Spectra, Signal To Noise Ratios, Spectral Line Width, Spectrum Analysis

Scientific paper

The authors report very high signal-to-noise observations in the wavelength range where interstellar MgH and NaH absorption lines could be observed. They improve the detected equivalent width limit by a factor over 6 for NaH and 100 for MgH on the line of sight to ζ Oph. The new upper limit derived for the column density of MgH is below the one expected if grain formation processes are efficient.

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