Observations of H^+_3 in Dense Molecular Clouds

Details Observations of H^+_3 in Dense Molecular Clouds Observations of H^+_3 in Dense Molecular Clouds

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522..338m&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 1, pp. 338-348.

Astronomy and Astrophysics

Astronomy

62

Infrared: Ism: Lines And Bands, Ism: Clouds, Ism: Molecules, Molecular Processes

Scientific paper

H^+_3 has been detected using infrared absorption spectroscopy along the lines of sight to six infrared sources in dense molecular clouds: AFGL 2136, W33A, Mon R2 IRS 3, AFGL 961E, AFGL 2591, and AFGL 490. Upper limits to the column densities of H^+_3 are reported for an additional nine sources. The column densities of CO toward Mon R2 IRS 3 and AFGL 961E have been determined from observations of the first-overtone lines of CO. For the six sources toward which H^+_3 was detected, a simple model of H^+_3 chemistry has been used together with column densities of H_2 derived from infrared CO measurements to estimate column lengths, mean number densities, and temperatures of molecular clouds. The derived column lengths are on the order of a parsec, the number densities are 10^4-10^5 cm^-3, and the temperatures are ~25-50 K.

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