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Related Experiment Videos

The diffuse interstellar bands: a tracer for organics in the diffuse interstellar medium?

F Salama1

  • 1Space Science Division, NASA-Ames Research Center, Moffett Field, CA 94035-1000, USA.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|September 22, 1998
PubMed
Summary
This summary is machine-generated.

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Diffuse interstellar bands (DIBs) are linked to complex organic molecules in space. These findings suggest widespread organic chemistry in the interstellar medium, impacting prebiotic molecule evolution and life

Area of Science:

  • Astrochemistry
  • Interstellar Medium Physics
  • Astrobiology

Background:

  • Diffuse interstellar bands (DIBs) are spectral features observed in stars obscured by interstellar dust.
  • DIBs serve as crucial tracers for organic molecules within the diffuse interstellar medium (ISM).

Purpose of the Study:

  • To identify the molecular carriers responsible for the diffuse interstellar bands.
  • To investigate the role of polycyclic aromatic hydrocarbons (PAHs) as potential DIB carriers.

Main Methods:

  • Combined astronomical observations.
  • Laboratory experiments.
  • Theoretical calculations.

Main Results:

  • Complex organic molecules, including neutral and ionized polycyclic aromatic hydrocarbons (PAHs), fullerenes, and unsaturated hydrocarbons, are the most promising candidates for DIBs.

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  • Aromatic hydrocarbons show particularly strong evidence as DIB carriers.

    • Conclusions:

    • The diffuse interstellar medium hosts a widespread distribution of complex organic molecules.
    • This distribution has significant implications for interstellar chemical complexity and the origin of life through exogenous delivery of prebiotic molecules.