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The survival of PAHs and (hydro)carbon nanoparticles in H II regions

Published online by Cambridge University Press:  18 July 2017

Elisabetta R. Micelotta ,
Marco Bocchio ,
Aurélie Rémy-Ruyer ,
Melanie Köhler ,
Nathalie Ysard  and
Anthony P. Jones
Elisabetta R. Micelotta
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com
Marco Bocchio
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com School of Physics and Astronomy, Queen Mary University of London, London, UK
Aurélie Rémy-Ruyer
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com
Melanie Köhler
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com INAF – Osservatorio Astrofisico di Arcetri, Firenze, Italy
Nathalie Ysard
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com
Anthony P. Jones
Affiliation:
Institut d'Astrophysique Spatiale, Université Paris-Sud and CNRS, Orsay, France email: elisabetta.micelotta@ias.u-psud.fr, elisabetta.micelotta@gmail.com
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Abstract

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Observations show that emission from the Unidentified Infrared (UIR) bands is strongly suppressed in H II regions. UIR bands are generally attributed to vibrational relaxation of FUV - excited Polycyclic Aromatic Hydrocarbon (PAH) molecules or hydrocarbon nanoparticles containing aromatic domains. If the strongly reduced UIR emission in H II regions is due to the suppression of the carriers, an efficient destruction mechanism is required to explain observations. The aim of this work is to clarify whether UV processing of PAHs and nanoparticles is indeed responsible for the observed lack of infrared emission. We present here our first results on the physical response to photo-processing of the proposed UIR-bands carriers.

Keywords

molecular processesH II regionsISM: lines and bandsdustextinction
Type
Addendum
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , E23
Copyright
Copyright © International Astronomical Union 2017 

References

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Micelotta, E. R. et al. 2010b, A&A, 510, A37+Google Scholar
Micelotta, E. R. et al. 2015, in preparation Google Scholar