Ammonia observations of the molecular cloud near S106

Astronomy and Astrophysics – Astronomy

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Ammonia, Interstellar Gas, Nebulae, Gas Temperature, H Ii Regions, Interstellar Masers, Line Spectra, Ultraviolet Astronomy, Water Masers

Scientific paper

The region surrounding the optical nebula S106 has been mapped in the J = 1, K = 1(1, 1) transition of ammonia with a 2.2-arcmin beam. The source is observed as two components, with the H II region sandwiched between them. The recently discovered H2O maser appears to lie in one of the components. The results give support to the notion that the asymmetry of the optical nebula is produced by preferential escape of UV radiation from the central source of excitation in directions of reduced density within the molecular condensation. From simultaneous observations of the (1, 1) and (2, 2) transitions, a kinetic temperature in the range 18-22 K is deduced for the NH3 molecules.

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