Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-24
Mon.Not.Roy.Astron.Soc. 356 (2005) 1099-1106
Astronomy and Astrophysics
Astrophysics
18 pages, 2 figures
Scientific paper
10.1111/j.1365-2966.2004.08537.x
Published interpretations of the relative intensity variations of the Unidentified Infrared Bands (UIBs) and their underlying continuum are discussed. An alternative model is proposed, in which a single carrier for both emits a) mostly a continuum when it is electronically excited by photons (visible or UV), or b) exclusively the UIBs, when only chemical energy is deposited by H capture on its surface, inducing only nuclear vibrations. The bands will dominate in atomic H regions but will be overcome by thermal continuum radiation when the ambient field is strong but lacks dissociating photons (900-1100 Angstroms). The model applies to PDRs as well as to limbs of molecular clouds in the ISM and agrees quantitatively with recent satellite observations. It gives indications on atomic H density and UIB intensity provided the ambient radiation field is known. It invokes no chemical, electronic, structural or size change in order to interpret the observed intensity variations.
No associations
LandOfFree
On the band-to-continuum intensity ratio in the infrared spectra of interstellar carbonaceous dust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the band-to-continuum intensity ratio in the infrared spectra of interstellar carbonaceous dust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the band-to-continuum intensity ratio in the infrared spectra of interstellar carbonaceous dust will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-89131