2006A&A...460..519R


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET23:00:29

2006A&A...460..519R - Astronomy and Astrophysics, volume 460, 519-531 (2006/12-3)

Formation and destruction of polycyclic aromatic hydrocarbon clusters in the interstellar medium.

RAPACIOLI M., CALVO F., JOBLIN C., PARNEIX P., TOUBLANC D. and SPIEGELMAN F.

Abstract (from CDS):

The competition between the formation and destruction of coronene clusters under interstellar conditions is investigated theoretically. The unimolecular nucleation of neutral clusters is simulated with an atomic model combining an explicit classical force field and a quantum tight-binding approach. Evaporation rates are calculated in the framework of the phase space theory and are inserted in an infrared emission model and compared with the growth rate constants. It is found that, in interstellar conditions, most collisions lead to cluster growth. The time evolution of small clusters (containing up to 312 carbon atoms) was specifically investigated under the physical conditions of the northern photodissociation region of NGC 7023. These clusters are found to be thermally photoevaporated much faster than they are reformed, thus providing an interpretation for the lowest limit of the interstellar cluster size distribution inferred from observations. The effects of ionizing the clusters and density heterogeneities are also considered. Based on our results, the possibility that PAH clusters could be formed in PDRs is critically discussed.

Abstract Copyright:

Journal keyword(s): astrochemistry - molecular processes - ISM: molecules - reflection nebulae - dust, extinction

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 EM* SR 3 Y*O 16 26 09.3231207767 -24 34 12.176811236   10.9 9.88   9.01 A0 109 0
2 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 642 0
3 HD 200775 Ae* 21 01 36.9184805541 +68 09 47.770037306 7.34 7.754 7.427 8.13   B2Ve 518 0
4 NAME Cave Nebula RNe 22 13 27 +70 15.3           ~ 53 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-23:00:29

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