2005ApJ...633..262V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST03:38:17

2005ApJ...633..262V - Astrophys. J., 633, 262-271 (2005/November-1)

Blue luminescence and the presence of small polycyclic aromatic hydrocarbons in the interstellar medium.

VIJH U.P., WITT A.N. and GORDON K.D.

Abstract (from CDS):

Blue luminescence (BL) was first discovered in a proto-planetary nebula, the Red Rectangle (RR), surrounding the post-AGB star HD 44179. BL has been attributed to fluorescence by small, 3-4 ringed neutral polycyclic aromatic hydrocarbon (PAH) molecules and was thought to be unique to the RR environment, where such small molecules are actively being produced and shielded from the harsh interstellar radiation by a dense circumstellar disk. In this paper we present the BL spectrum detected in several ordinary reflection nebulae illuminated by stars having temperatures between 10,000 and 23,000 K. All these nebulae are known to also exhibit the infrared emission features called aromatic emission features (AEFs) attributed to large PAHs. We present the spatial distribution of the BL in these nebulae. In the case of Ced 112, the BL is spatially correlated with mid-IR emission structures attributed to AEFs. These observations provide evidence for grain processing and possibly for in situ formation of small grains and large molecules from larger aggregates. Most importantly, the detection of BL in these ordinary reflection nebulae suggests that the BL carrier is an ubiquitous component of the interstellar medium and is not restricted to the particular environment of the RR.

Abstract Copyright:

Journal keyword(s): Astrochemistry - ISM: Dust, Extinction - ISM: individual (Ced 112) - ISM: Individual: Alphanumeric: Ced 201 - ISM: Individual: NGC Number: NGC 2023 - ISM: individual (NGC 5367) - ISM: Molecules - Radiation Mechanisms: General - ISM: Reflection Nebulae

Simbad objects: 13

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Number of rows : 13

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 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
2 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
3 HD 37903 Em* 05 41 38.3889407943 -02 15 32.476182358 7.32 7.94 7.83 7.64 7.52 B3IV 323 1
4 LDN 1630 DNe 05 45.5 -00 59           ~ 350 0
5 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 715 0
6 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
7 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 31 0
8 CG 12 CGb 13 57 42.2 -39 56 21           ~ 48 1
9 NGC 5367 RNe 13 57 44 -39 58.8           ~ 29 1
10 CD-39 8581 Ae? 13 57 44.11656 -39 58 44.1660           B4+B7 47 0
11 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 630 0
12 BD+69 1231 *iN 22 13 24.5281828482 +70 15 05.077858884   9.41 9.29     B9.5V 44 2
13 NAME Cave Nebula RNe 22 13 27 +70 15.3           ~ 52 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-03:38:17

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