Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 22nd May 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.

Volume 109, 1998
Previous Article Next Article

H3+ in dense and diffuse clouds


Interstellar H3+ has been detected in dense as well as diffuse clouds using three 3.7 µm infrared spectral lines of the ν2 fundamental band. Columndensities of H3+ from (1.7–5.5)×1014 cm-2 have been measured in denseclouds in absorption against the infrared continua of the deeply embedded young stellar objects GL2136, W33A, MonR2 IRS 3, GL961E, and GL2591. Strong and broad H3+ absorptions have been detected in dense and diffuse clouds towards GC IRS 3 and GCS3-2 in the region of the galactic center. A large column density of H3+, comparable to that of a dense cloud, has been detected towards the visible star Cygnus OB2 No. 12, which has a line of sight that crosses mostly diffuse clouds. The H3+ chemistry of dense and diffuse clouds are discussed using a very simple model. Some future projects and problems are discussed.

Back to tab navigation

Article type: Paper
DOI: 10.1039/A800655E
Faraday Discuss., 1998,109, 267-280

  •   Request permissions

    H3+ in dense and diffuse clouds

    B. J. McCall, K. H. Hinkle, T. R. Geballe and T. Oka, Faraday Discuss., 1998, 109, 267
    DOI: 10.1039/A800655E

Search articles by author