A search for O18H maser emission from G351.8 - 0.5

Details A search for O18H maser emission from G351.8 - 0.5 A search for O18H maser emission from G351.8 - 0.5

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..653f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 653, 654.

Astronomy and Astrophysics

Astrophysics

Hydroxyl Emission, Interstellar Masers, Nebulae, Abundance, Gas Density, H Ii Regions, Molecular Collisions, Oxygen Isotopes

Scientific paper

An unsuccessful search for 1637 MHz maser emission from O18H molecules in the H II/OH maser source G351.8 - 0.5 is reported. The detection limit of 25 mJy for 1637 MHz emission sets a lower limit of about 20,000:1 for the ratio of O16H/O18H emission. This limit implies that the column density of O16H molecules in G351.8 - 0.5 is less than 10 to the 18th cm. Comparison with models of OH masers in compressed shells around young H II regions suggests that the H II region associated with G351.8 - 0.5 has been expanding for at least 1000 years.

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