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Related Experiment Videos

Interstellar H(3)(+).

Takeshi Oka1

  • 1Departments of Chemistry and Astronomy and Astrophysics, Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA. t-oka@uchicago.edu

Proceedings of the National Academy of Sciences of the United States of America
|August 9, 2006
PubMed
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Protonated molecular hydrogen (H3+) is a key interstellar molecule that drives complex molecule formation. Recent infrared observations reveal vast amounts of warm, diffuse gas in the Galactic Center

Area of Science:

  • Astrochemistry
  • Interstellar Medium Physics
  • Molecular Spectroscopy

Background:

  • Protonated molecular hydrogen (H3+) is the simplest polyatomic molecule and a crucial ion in interstellar chemistry.
  • Despite its low concentration due to high reactivity, H3+ initiates ion-molecule reactions forming complex molecules.
  • H3+ is a strong acid, acting as a proton donor in interstellar environments.

Purpose of the Study:

  • To summarize current understanding of H3+ in interstellar space based on infrared observations since 1996.
  • To discuss recent observations and analyses of H3+ in the Galactic Center's Central Molecular Zone.
  • To highlight the revelation of abundant warm, diffuse gas in this region.

Main Methods:

  • Infrared astronomical observations.

Related Experiment Videos

  • Spectroscopic analysis of H3+ emission and absorption.
  • Chemical modeling of interstellar ion-molecule reactions.

    • Main Results:

    • H3+ plays a fundamental role in interstellar chemistry as a primary ion.
    • Recent observations in the Galactic Center's Central Molecular Zone have provided new insights.
    • A significant quantity of warm and diffuse gas has been detected in this region.

    Conclusions:

    • H3+ is essential for understanding interstellar molecule formation.
    • Infrared observations continue to advance our knowledge of H3+ and its environment.
    • The Galactic Center harbors substantial amounts of previously undetected warm, diffuse gas.