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Diffuse interstellar bands: a comprehensive laboratory study.

Fred M Johnson1

  • 1Cal State University Fullerton, Department of Physics, Fullerton, CA 92834, USA. drfmjohnson@hotmail.com

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 16, 2006
PubMed
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Diffuse interstellar bands are identified as originating from magnesium tetrabenzoporphyrin (MgTBP) and related molecules within interstellar grains. Pyridine explains the UV bump, with MgTBP spectra matching observations of the Red Rectangle star HD44179.

Area of Science:

  • Astrochemistry
  • Spectroscopy
  • Organic Chemistry

Background:

  • Diffuse interstellar bands (DIBs) are absorption features in astronomical spectra.
  • The molecular carriers of DIBs have long been sought.
  • The Red Rectangle nebula offers a unique laboratory for studying these phenomena.

Purpose of the Study:

  • To identify the chromophores responsible for diffuse interstellar bands.
  • To explain the origin of the ubiquitous UV bump.
  • To analyze the spectral properties of candidate molecules.

Main Methods:

  • Experimental spectroscopy of candidate molecules (MgTBP, H(2)TBP, pyridine) in laboratory conditions.
  • Analysis of emission spectra from the Red Rectangle central star (HD44179).

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  • Comparison of laboratory data with astronomical observations.

    • Main Results:

    • Magnesium tetrabenzoporphyrin (MgTBP) and H(2)TBP are implicated as DIB carriers.
    • A paraffin matrix containing TBPs (grains) and pyridine are identified.
    • Pyridine's transmission window at 2175 Å explains the UV bump.
    • Observed spectra of HD44179 match laboratory spectra of bare MgTBP.
    • An effective grain temperature of 2.728 K was deduced.

    Conclusions:

    • MgTBP and related organic molecules are primary carriers of diffuse interstellar bands.
    • Pyridine in interstellar grains accounts for the UV bump.
    • Laboratory findings strongly support the proposed molecular identifications for DIBs.