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PAH clusters as interstellar very small grains

Published online by Cambridge University Press:  12 October 2020

Joseph. E. Roser Open the ORCID record for Joseph. E. Roser [Opens in a new window]  and
Alessandra Ricca Open the ORCID record for Alessandra Ricca [Opens in a new window]
Joseph. E. Roser
Affiliation:
SETI Institute, 189 Bernardo Ave. Suite #200, Mountain View, CA94043 emails: [email protected], [email protected] NASA Ames Research Center, Mail Stop 245-6, Bldg. N245, Rm. 148, P.O. Box 1, Moffett Field, CA94035
Alessandra Ricca
Affiliation:
SETI Institute, 189 Bernardo Ave. Suite #200, Mountain View, CA94043 emails: [email protected], [email protected] NASA Ames Research Center, Mail Stop 245-6, Bldg. N245, Rm. 148, P.O. Box 1, Moffett Field, CA94035
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Abstract

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PAH clusters are one candidate species for the interstellar “very small grains” or “VSGs”, i.e., dust grains small enough to be stochastically heated and contribute to the aromatic infrared emission bands (AIBs). This possibility motivated laboratory experiments on the infrared spectroscopy of PAH clusters using matrix isolation spectroscopy. The spectral shifts due to PAH clustering in argon matrices provide clues for the AIB contribution from PAH clusters in the interstellar medium. Here we review results from a number of small PAH species, extrapolation to the much larger PAHs believed to be present in the interstellar medium, and the implications for a PAH cluster contribution to the VSG population.

Keywords

astrochemistrymolecular dataISM: line and bandsinfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 415 - 416
Copyright
© International Astronomical Union 2020

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