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Measurements of the 3.3 μm Diffuse Galactic Emission Feature with AROME

Published online by Cambridge University Press:  08 February 2017

M. Giard ,
F. Pajot ,
J. M. Lamarre  and
G. Serra
M. Giard
Affiliation:
IAS/CNRS BP 10 F91371 Verrières-le-Buisson cedex France
F. Pajot
Affiliation:
IAS/CNRS BP 10 F91371 Verrières-le-Buisson cedex France
J. M. Lamarre
Affiliation:
IAS/CNRS BP 10 F91371 Verrières-le-Buisson cedex France
G. Serra
Affiliation:
CESR/CNRS BP 4346 F31029 Toulouse cedex France

Abstract

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AROME∗ is a balloon-borne experiment which was built to carry out measurements of IR emission features in the diffuse galactic flux. The field of view is 0.5° and surface brightness gradients are detected through azimuthal scanning at a constant elevation angle. The detection of a feature is done by comparison of the fluxes measured in narrow and wide photometric bands centered on the feature's wavelength. Two flights have been performed (August 1987, October 1988), which detected a 3.3 μm feature in the direction of the galactic plane −6° < b < 6°, 60° > l > −50°. Since this feature is characteristic of aromatic C-H bonds, we assigned it to the emission of transiently heated polycyclic aromatic hydrocarbon molecules (PAHs). With this assumption, AROME measurements show that PAHs are an ubiquitous component of the interstellar matter which contain about 10% of the available cosmic carbon.

Type
III. Diffuse Galactic Radiation from Dust and Gas: Observations and Models
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 212 - 213
Copyright
Copyright © Kluwer 1990 

References

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