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Related Experiment Videos

H3+ in dense and diffuse clouds

B J McCall1, K H Hinkle, T R Geballe

  • 1Department of Astronomy and Astrophysics, University of Chicago, IL 60637, USA.

Faraday Discussions
|November 11, 1998
PubMed
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Interstellar trihydrogen cation (H3+) was detected in dense and diffuse interstellar clouds using infrared spectroscopy. This finding provides new insights into the chemistry and composition of interstellar gas.

Area of Science:

  • Astronomy
  • Astrophysics
  • Astrochemistry

Background:

  • The trihydrogen cation (H3+) is a key molecule in interstellar chemistry.
  • Understanding H3+ distribution and abundance is crucial for modeling interstellar clouds.
  • Previous detections were limited, necessitating further investigation across different cloud types.

Purpose of the Study:

  • To detect and quantify interstellar H3+ in both dense and diffuse clouds.
  • To investigate the abundance and distribution of H3+ in various interstellar environments.
  • To explore the implications of H3+ detection for interstellar chemistry models.

Main Methods:

  • Utilized three specific infrared spectral lines (3.7 microns) from the nu 2 fundamental band of H3+.
  • Performed absorption spectroscopy towards embedded young stellar objects and background stars.

Related Experiment Videos

  • Measured column densities of H3+ using spectral line analysis.

    • Main Results:

    • Successfully detected interstellar H3+ in dense clouds, with column densities ranging from 1.7-5.5 x 10^14 cm^-2.
    • Observed strong and broad H3+ absorptions towards the galactic center, indicating significant presence in both dense and diffuse regions.
    • Found a large H3+ column density towards Cygnus OB2 No. 12, comparable to dense clouds, despite its line of sight crossing diffuse clouds.

    Conclusions:

    • Interstellar H3+ is a prevalent molecule detectable across diverse cloud conditions.
    • The abundance of H3+ provides valuable data for refining interstellar chemical models.
    • Future research should address remaining challenges and explore further observational projects.