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Related Experiment Videos

The galactic cosmic ray ionization rate.

A Dalgarno1

  • 1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA. adalgarno@cfa.harvard.edu

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2006
PubMed
Summary
This summary is machine-generated.

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Cosmic ray ionization shapes interstellar chemistry. New findings revise ionization rates, revealing differences between dense, diffuse, and intercloud interstellar medium environments.

Area of Science:

  • Astrochemistry
  • Interstellar Medium Physics
  • Cosmic Ray Physics

Background:

  • Cosmic ray ionization is a key driver of interstellar chemistry.
  • Understanding ionization rates is crucial for modeling interstellar clouds.

Purpose of the Study:

  • To summarize interstellar chemistry driven by cosmic ray ionization.
  • To review and update ionization rates derived from molecular abundances.
  • To investigate factors influencing molecular abundances in different cloud types.

Main Methods:

  • Analysis of molecular abundances in interstellar clouds.
  • Review of observational data and theoretical models.
  • Investigation of deuterated species to understand ion removal.

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Main Results:

  • Detection of abundant H(3)(+) led to upward revision of ionization rates.
  • Molecular abundances in dense clouds depend on depletion of various species and presence of large molecules/grains.
  • Measurements of deuterated species offer insights into ion removal, though uncertainties persist.

Conclusions:

  • Ionization rates appear to differ between dense, diffuse, and intercloud media.
  • Current models for interpreting observations may require significant updates.
  • Further research is needed to resolve uncertainties in ion removal mechanisms.