Abundant H3+ and High Values of ζ: Common Properties of Diffuse Clouds

Details Abundant H3+ and High Values of ζ: Common Properties of Diffuse Clouds Abundant H3+ and High Values of ζ: Common Properties of Diffuse Clouds

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113903g&link_type=abstract

American Astronomical Society, AAS Meeting #211, #139.03; Bulletin of the American Astronomical Society, Vol. 39, p.985

Astronomy and Astrophysics

Astronomy

Scientific paper

We have recently surveyed nineteen diffuse cloud sightlines for absorption by H3+ and have detected it along eight of these. To date H3+ has been detected
along fourteen diffuse cloud sightlines, which are well dispersed in galactic longitude, suggesting that H3+ is a common constituent of such clouds. From the simple chemistry associated with H3+ we infer the cosmic ray ionization rate of H2 in diffuse clouds to be 1 - 7 x 10-16 s-1, roughly an order of magnitude higher than the estimated rate in dark clouds. While the cause of such a high (and variable) rate is uncertain, recent models of diffuse cloud chemistry require ionization rates of this order, in accord with these results.

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