Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..194b&link_type=abstract
Astronomy and Astrophysics, v.339, p.194-200 (1998)
Astronomy and Astrophysics
Astrophysics
98
Ism: Clouds, Ism: Rho-Ophiuchi Cloud, Ism: Ngc 7023, Infrared: Ism: Lines And Bands, Infrared: Line Formation
Scientific paper
Modelling the unidentified infrared dust bands at 6.2 7.7, 8.6, 11.3, and 12.7 μm by Lorentz profiles is shown to produce excellent fits to the spectra obtained with the Continuous Variable Filter (CVF) of the instrument ISOCAM, on-board the Infrared Space Observatory (ISO). The feature pedestals are accounted for by the wide wings of the Lorentz curves which also account for a large fraction of the 10 μm ``continuum". The Lorentz shape of the features is believed to reveal intrinsic properties of the emitters, i.e. a very short life time of the excited state, of the order of a few 10(-13) s. This is attributed to internal vibrational redistribution (IVR) between thermally accessible modes of the particles, which can be raised at high temperature by absorption of a single photon. Particles of a few hundred atoms may meet both requirements.
Boisssel P.
Boulanger Francois
Cesarsky D.
Ryter Ch.
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