Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215...92g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 92-100.
Astronomy and Astrophysics
Astronomy
60
Balloon-Borne Instruments, Cyclic Hydrocarbons, Interstellar Matter, Milky Way Galaxy, H Ii Regions, Infrared Astronomy Satellite, Infrared Spectra, Molecular Clouds, Spatial Distribution
Scientific paper
Observations of diffuse Galactic emission in the aromatic IR band centered at 3.3 microns are reported. Data obtained in a 16-h trans-Mediterranean balloon flight on August 4, 1987 using the instrumentation of the Arome experiment (Giard et al., 1988) are presented in extensive graphs and intensity maps and characterized in detail. The continuum emission at 2.8-3.7 microns is found to be similar to that at 2.4 microns and is attributed to starlilght; the spatial intensity distribution of the 3.3-micron feature itself (attributed to C-H stretching modes of interstellar PAHs) is significantly different from that of the continuum and coincides with the distribution of giant molecular clouds and H II regions. It is inferred that about 40 percent of the 12-micron Galactic flux measured by IRAS comes from the longer-wavelength PAH bands.
Caux Emmanuel
Giard Martin
Lamarre Jean-Michel
Pajot François
Serra Giampaolo
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