2003A&A...410..639M -
Astronomy and Astrophysics, volume 410, 639-648 (2003/11-1)
Testing the ``strong'' PAHs hypothesis. II. A quantitative link between DIBs and far-IR emission features.
MULAS G., MALLOCI G. and BENVENUTI P.
Abstract (from CDS):
In Paper I (Malloci et al.,
2003A&A...410..623M) we proved the profile invariance of the first permitted electronic transition of the typical Polycyclic Aromatic Hydrocarbon cation C
32H
14+ as a first necessary check for the ``strong'' PAHs hypothesis. In this paper we derive a quantitative relation between the intensities of the former band, which ought to be observable in absorption in the visible range, and those of the far-IR bands, which are predicted by the PAH model to be simultaneously present in emission. Contrary to the mid-IR bands, collectively known as ``Unidentified Infrared Bands'' (UIBs), which do not discriminate specific molecules, the far IR, skeletal bands can be expected to be a fingerprint of each single species. This fact provides a number of independent constraints which must be simultaneously fulfilled for a successful PAH identification. Our approach thus offers a powerful criterion for the identification of specific PAHs, both in the presently available ISO data and in those of the forthcoming SIRTF and Herschel missions. As an interesting by-product, we quantitatively evaluate the impact of isotopic substitutions (
13C->
12C and D->H) on the resulting infrared emission bands.
Abstract Copyright:
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Journal keyword(s):
astrochemistry - line: identification - molecular processes - ISM: lines and bands - ISM: molecules - infrared: ISM
Simbad objects:
2
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