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2 results

  • The Infrared Emission Bands

  • E. Peeters
  • Journal:
    Proceedings of the International Astronomical Union / Volume 9 / Issue S297 / May 2013
    Published online by Cambridge University Press:
    21 February 2014, pp. 187-196
    Print publication:
    May 2013
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  • Up to 10% of the total power output of star-forming galaxies is emitted in the infrared emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 μm. Here, I will review the spectral characteristics of these IR emission bands, their dependence on the local environment, the implications for the physical and chemical characteristics of the carriers, and their applicability as a diagnostic tool.

  • The PAH Hypothesis after 25 Years

  • Els Peeters
  • Journal:
    Proceedings of the International Astronomical Union / Volume 7 / Issue S280 / June 2011
    Published online by Cambridge University Press:
    21 December 2011, pp. 149-161
    Print publication:
    June 2011
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  • The infrared spectra of many galactic and extragalactic objects are dominated by emission features at 3.3, 6.2, 7.7, 8.6 and 11.2 μm. The carriers of these features remained a mystery for almost a decade, hence the bands were dubbed the unidentified infrared (UIR) bands. Since the mid-80's, the UIR bands are generally attributed to the IR fluorescence of Polycyclic Aromatic Hydrocarbon molecules (PAHs) upon absorption of UV photons – the PAH hypothesis. Here we review the progress made over the past 25 years in understanding the UIR bands and their carriers.