2012A&A...542A..69P


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.21CET05:45:57

2012A&A...542A..69P - Astronomy and Astrophysics, volume 542A, 69-69 (2012/6-1)

Evaporating very small grains as tracers of the UV radiation field in photo-dissociation regions.

PILLERI P., MONTILLAUD J., BERNE O. and JOBLIN C.

Abstract (from CDS):

In photo-dissociation regions (PDRs), polycyclic aromatic hydrocarbons (PAHs) may be produced by evaporation of very small grains (VSGs) by the impinging UV radiation field from a nearby star. We quantitatively investigate the transition zone between evaporating VSGs (eVSGs) and PAHs in several PDRs. We studied the relative contribution of PAHs and eVSGs to the mid-IR emission in a wide range of excitation conditions. We fitted the observed mid-IR emission of PDRs by using a set of template band emission spectra of PAHs, eVSGs, and gas lines. The fitting tool PAHTAT (PAH Toulouse Astronomical Templates) is made available to the community as an IDL routine. From the results of the fit, we derived the fraction of carbon feVSG locked in eVSGs and compared it to the intensity of the local UV radiation field. We show a clear decrease of feVSG with increasing intensity of the local UV radiation field, which supports the scenario of photo-destruction of eVSGs. Conversely, this dependence can be used to quantify the intensity of the UV radiation field for different PDRs, including unresolved ones. PAHTAT can be used to trace the intensity of the local UV radiation field in regions where eVSGs evaporate, which correspond to relatively dense (nH=[100,105]cm–3) and UV irradiated PDRs (G0=[100,5x104]) where H2 emits in rotational lines.

Abstract Copyright:

Journal keyword(s): photon-dominated region (PDR) - astrochemistry - dust, extinction - ISM: lines and bands - infrared: ISM - ISM: molecules

CDS comments: Tables 1 and 2 substructures N, W, S not in Simbad.

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 63 HII 00 59 01.37 +60 53 17.8   13.33       ~ 79 1
2 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 691 0
3 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 431 0
4 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 560 1
5 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 317 1
6 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 635 2
7 NGC 2316 Cl* 06 59 41.7 -07 46 07           ~ 45 1
8 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5226 6
9 HD 147889 pr* 16 25 24.3162969787 -24 27 56.570239619 8.56 8.73 7.90     B2III/IV 426 1
10 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 593 2
11 NAME rho Oph W reg 16 25 57 -24 20.8           ~ 20 1
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2938 0
13 NGC 7023 BNe 21 01 36.9 +68 09 48   7.20       ~ 604 0
14 HD 200775 Ae* 21 01 36.9184805541 +68 09 47.770037306 7.34 7.73 7.36     B2Ve 503 0
15 NAME Cave Nebula RNe 22 13 27 +70 15.3           ~ 50 0

    Equat.    Gal    SGal    Ecl

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2019.11.21-05:45:57

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