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Effects of cosmic rays on hydrocarbon interstellardust

Published online by Cambridge University Press:  13 February 2013

M. Godard ,
G. Féraud ,
M. Chabot ,
Y. Carpentier ,
T. Pino ,
R. Brunetto ,
J. Duprat ,
C. Engrand ,
P. Bréchignac  and
L. d’Hendecourt
...Show all authors
M. Godard
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France Astrochemistry Laboratory (Code 691), NASA Goddard Space Flight Center, Building 34, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
G. Féraud
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
M. Chabot
Affiliation:
Institut de Physique Nucléaire d’Orsay, Univ. Paris-Sud, Bât. 102, 91405 Orsay, France
Y. Carpentier
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France Laboratoire de Physique des Lasers, Atomes et Molécules, Univ. Lille 1, Bât. P5, 59655 Villeneuve d’Ascq Cedex, France
T. Pino
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
R. Brunetto
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France
J. Duprat
Affiliation:
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Univ. Paris-Sud, Bât. 104, 91405 Orsay, France
C. Engrand
Affiliation:
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Univ. Paris-Sud, Bât. 104, 91405 Orsay, France
P. Bréchignac
Affiliation:
Institut des Sciences Moléculaires d’Orsay, Univ. Paris-Sud, Bât. 210, 91405 Orsay, France
L. d’Hendecourt
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France
E. Dartois
Affiliation:
Institut d’Astrophysique Spatiale, Univ. Paris-Sud, Bât. 121, 91405 Orsay, France

Abstract

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Hydrogenated amorphous carbons, an important component of the interstellar carbonaceousdust, possess infrared spectral signatures (at 3.4, 6.9 and 7.3 μm) thatare ubiquitous in the diffuse interstellar medium of galaxies, but not observed in denseclouds. To better understand the role played by cosmic rays in the disappearance of theseabsorption bands, irradiation experiments of hydrocarbon dust analogues have beenperformed with different swift ions. The results obtained through the in situinfrared monitoring of the samples during the irradiations allow to infer thedehydrogenation effect of the cosmic ray distribution on the interstellar hydrogenatedamorphous carbons. The importance of this interstellar dust destruction by cosmic rays isdiscussed in comparison to other energetic processes in different interstellarenvironments.

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