FM12p.26 — Structural Evolution of Interstellar Polycyclic Aromatic Hydrocarbons

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Mark Hammonds2, Alessandra Candian1, Tamami Mori2, Fumihiko Usui2, Takashi Onaka2

Institution(s): 1. Leiden Observatory, 2. University of Tokyo

Polycyclic Aromatic Hydrocarbons (PAHs) are an important reservoir for molecular carbon in the interstellar medium (ISM), and investigations into their chemistry and behaviour may be important to the understanding of how carbon is processed from simple forms into complex prebiotic molecules such as those detected in chondritic meteorites. In this study, infrared astronomical data from AKARI and other observatories are used together with laboratory and theoretical data to study variations in the structure of emitting PAHs in interstellar environments using spectroscopic decomposition techniques and bands arising from carbon-hydrogen bond vibrations at wavelengths from 3 – 14 microns. Results and inferences are discussed in terms of the processing of large carbonaceous molecules in astrophysical environments.