2005A&A...429..193R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET11:54:29

2005A&A...429..193R - Astronomy and Astrophysics, volume 429, 193-204 (2005/1-1)

Spectroscopy of polycyclic aromatic hydrocarbons and very small grains in photodissociation regions.

RAPACIOLI M., JOBLIN C. and BOISSEL P.

Abstract (from CDS):

We have coupled a singular value decomposition method with a Monte Carlo search algorithm to analyse the mid-infrared ISOCAM spectral maps of photodissociation regions (PDRs) in NGC 7023 and ρ Oph-SR3.Three different spectra and their associated spatial distribution were extracted from this analysis. It is shown that they can be associated with polycyclic aromatic hydrocarbons (PAHs) in their cationic and neutral forms and a third population of carbonaceous very small grains (VSGs). The method allows for the first time (i) to separate the contribution of neutral PAHs to the interstellar emission spectrum from that of cationic PAHs; (ii) to show that the 7.8µm component of the ``7.7µm'' broad feature is carried by VSGs, whereas the 7.6µm component is due to PAHs; and (iii) to give evidence that free-flying PAHs are produced in PDRs by photoevaporation of VSGs. It is proposed that these carbonaceous VSGs are indeed PAH clusters. We derived a minimal size of 400 carbon atoms per cluster and estimated a UV absorption power of the order of 10–24W/C for their dissociation.

Abstract Copyright:

Journal keyword(s): ISM: lines and bands - ISM: clouds - ISM: dust, extinction - methods: data analysis - astrochemistry

Simbad objects: 14

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Number of rows : 14

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 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 129 0
2 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1253 1
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 743 0
4 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 580 1
5 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1212 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1084 1
8 LDN 1630 DNe 05 45.5 -00 59           ~ 356 0
9 EM* SR 3 Y*O 16 26 09.3231207767 -24 34 12.176811236   10.9 9.88   9.01 A0 109 0
10 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3138 1
11 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1508 0
12 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 642 0
13 HD 200775 Ae* 21 01 36.9184805541 +68 09 47.770037306 7.34 7.754 7.427 8.13   B2Ve 518 0
14 NAME Cave Nebula RNe 22 13 27 +70 15.3           ~ 53 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-11:54:29

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