CONTRIBUTION OF METAL-BONDED POLYCYCLIC AROMATIC-HYDROCARBONS TO THE INTERSTELLAR DEPLETION

Citation
A. Klotz et al., CONTRIBUTION OF METAL-BONDED POLYCYCLIC AROMATIC-HYDROCARBONS TO THE INTERSTELLAR DEPLETION, Astronomy and astrophysics, 304(2), 1995, pp. 520-530
Citations number
53
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
00046361
Volume
304
Issue
2
Year of publication
1995
Pages
520 - 530
Database
ISI
SICI code
0004-6361(1995)304:2<520:COMPAT>2.0.ZU;2-U
Abstract
A satisfactory correlation is described between the bonding energy of a given metal coordinated to a PAH and its observed interstellar deple tion. As a consequence, a modelling was elaborated based on the observ ed depletion of metals and on the theory of thermo-photo-dissociation of organometallic molecules. In this modelling, the abundance of organ ometallic species is calculated to explain about 5 to 10% of the deple tion in the diffuse interstellar medium. Moreover, a constraint on the size distribution of PAHs is presented which is close to the standard distribution deduced by Desert et al. (1990) from a modelling of infr ared radiations emitted by the interstellar matter.