Using SOFIA and Spitzer to Probe the Size Distribution of PAHs

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Presentation transcript:

Using SOFIA and Spitzer to Probe the Size Distribution of PAHs C. Knight1, E. Peeters1,2, A.G.G.M. Tielens3, O. Berné4,5, D.J. Stock1 (1) University of Western Ontario, (2) SETI Institute, (3) Leiden Observatory, (4) Université de Toulouse, (5) CNRS, IRAP Board #108 We use MIR observations to probe the polycyclic aromatic hydrocarbon (PAH) size distribution and ionization balance in two prominent reflection nebulae. NGC 2023 NGC 7023 ● PAH Size 11.2/3.3 um Ionization 8/11.2 um Find the average PAH size and ionization increases towards the illuminating source. ● Implies a photochemical evolution of these species within these regions. ●