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Related Experiment Videos

Polycyclic aromatic hydrocarbons and the diffuse interstellar bands: a survey.

F Salama1, G A Galazutdinov, J Krelowski

  • 1NASA-Ames Research Center, Space Science Division, Moffett Field, CA 94035-1000, USA. fsalama@mail.arc.nasa.gov

The Astrophysical Journal
|September 7, 2001
PubMed
Summary
This summary is machine-generated.

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Polycyclic aromatic hydrocarbon ions (PAHs) may explain some diffuse interstellar bands (DIBs). Laboratory spectra suggest PAH ions are plausible candidates, though further gas-phase studies are needed for confirmation.

Area of Science:

  • Astronomy and Astrophysics
  • Astrochemistry
  • Spectroscopy

Background:

  • Diffuse interstellar bands (DIBs) are observed in astronomical spectra but their origin remains largely unknown.
  • Polycyclic aromatic hydrocarbons (PAHs) are proposed as carriers for some DIBs.
  • Understanding DIBs provides insights into the composition and physical conditions of interstellar clouds.

Purpose of the Study:

  • To investigate the hypothesis that neutral and ionized PAHs are responsible for some DIBs.
  • To compare laboratory spectra of PAHs with astronomical observations of DIBs.
  • To guide future laboratory experiments for PAH research.

Main Methods:

  • Laboratory spectroscopy of isolated PAHs in inert gas matrices at low temperatures.
  • Comparison of laboratory PAH spectra with astronomical spectra of reddened early-type stars.

Related Experiment Videos

  • Analysis of available gas-phase spectra of PAH ions.

    • Main Results:

    • Laboratory spectra suggest that PAH ions are strong candidates for some DIBs.
    • Solid matrix isolation causes wavelength shifts and band broadening, complicating direct spectral assignments.
    • Gas-phase spectra of PAH ions show similarities but require further data for definitive matches.

    Conclusions:

    • PAH ions are likely contributors to some diffuse interstellar bands.
    • Matrix effects in laboratory spectra hinder unambiguous identification of PAH-DIB correlations.
    • Future research should focus on gas-phase laboratory measurements of PAH ions, particularly in jet expansions, to confirm their role in DIBs.