2008A&A...479L..41B


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET03:28:02

2008A&A...479L..41B - Astronomy and Astrophysics, volume 479, L41-44 (2008/3-1)

Extended Red Emission and the evolution of carbonaceous nanograins in NGC 7023.

BERNE O., JOBLIN C., RAPACIOLI M., THOMAS J., CUILLANDRE J.-C. and DEVILLE Y.

Abstract (from CDS):

Extended Red Emission (ERE) was recently attributed to the photo-luminescence of either doubly ionized Polycyclic Aromatic Hydrocarbons (PAH++), or charged PAH dimers ([PAH2]+). We analysed the visible and mid-infrared (mid-IR) dust emission in the North-West and South photo-dissociation regions of the reflection nebula NGC 7023. Using a blind signal separation method, we extracted the map of ERE from images obtained with the Hubble Space Telescope, and at the Canada France Hawaii Telescope. We compared the extracted ERE image to the distribution maps of the mid-IR emission of Very Small Grains (VSGs), neutral and ionized PAHs (PAH0 and PAH+) obtained with the Spitzer Space Telescope and the Infrared Space Observatory. ERE is dominant in transition regions where VSGs are being photo-evaporated to form free PAH molecules, and is not observed in regions dominated by PAH+. Its carrier makes a minor contribution to the mid-IR emission spectrum. These results suggest that the ERE carrier is a transition species formed during the destruction of VSGs. [PAH2]+ appear as good candidates but PAH++ molecules seem to be excluded.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: dust, extinction - ISM: lines and bands - reflection nebulae - infrared: ISM - methods: observational

Simbad objects: 5

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Number of rows : 5

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 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 706 0
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5238 6
3 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 791 2
4 NGC 7023 BNe 21 01 36.9 +68 09 48   7.20       ~ 605 0
5 HD 200775 Ae* 21 01 36.9184805541 +68 09 47.770037306 7.34 7.73 7.36     B2Ve 504 0

    Equat.    Gal    SGal    Ecl

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2019.12.13-03:28:02

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