2016A&A...586A..65D

Query : 2016A&A...586A..65D

2016A&A...586A..65D - Astronomy and Astrophysics, volume 586A65-65 (2016/2-1)

Deuterated polycyclic aromatic hydrocarbons: Revisited.

DONEY K.D., CANDIAN A., MORI T., ONAKA T. and TIELENS A.G.G.M.

Abstract (from CDS):

The amount of deuterium locked up in polycyclic aromatic hydrocarbons (PAHs) has to date been an uncertain value. We present a near-infrared (NIR) spectroscopic survey of HII regions in the Milky Way, Large Magellanic Cloud, and Small Magellanic Cloud obtained with AKARI, which aims to search for features indicative of deuterated PAHs (PAD or Dn-PAH) to better constrain the D/H ratio of PAHs. Fifty-three HII regions were observed in the NIR (2.5-5µm), using the Infrared Camera (IRC) on board the AKARI satellite. Through comparison of the observed spectra with a theoretical model of deuterated PAH vibrational modes, the aromatic and (a)symmetric aliphatic C-D stretch modes were identified. We see emission features between 4.4-4.8µm, which could be unambiguously attributed to deuterated PAHs in only six of the observed sources, all of which are located in the Milky Way. In all cases, the aromatic C-D stretching feature is weaker than the aliphatic C-D stretching feature, and, in the case of M17b, this feature is not observed at all. Based on the weak or absent PAD features in most of the observed spectra, it is suggested that the mechanism for PAH deuteration in the ISM is uncommon.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - HII regions - infrared: ISM

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LHA 115-N 10 Y*O 00 44 56.578 -73 10 10.52   14.66 15.1 15.96   B0 47 1
2 LHA 115-N 26 PN 00 48 08.624 -73 14 54.62 14.70 15.22 14.31   14.57 ~ 61 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
4 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 251 0
5 HD 7113 Em* 01 09 12.94464 -73 11 38.8968     11.7     ~ 131 0
6 LHA 115-N 88A HII 01 24 07.823 -73 09 03.77   13.25 12.18     ~ 83 1
7 IC 2105 HII 04 49 26 -69 12.0   12.68 12.78     ~ 17 2
8 NGC 1714 EmO 04 52 08.4 -66 55 23   11.51 11.61     ~ 88 2
9 LHA 120-N 83B HII 04 54 25.2 -69 11 00           ~ 48 1
10 LHA 120-N 91A HII 04 57.1 -68 26           ~ 8 1
11 HD 33540 * 05 04 38.1113422584 -70 54 41.848525116   12.73 12.74 13.89 13.48 O/B2:e 45 0
12 [WSI2008] 318 Y*O 05 09 50.547 -68 53 05.29           ~ 14 1
13 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
14 LHA 120-N 57A HII 05 32 28.2 -67 42 11           ~ 52 1
15 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 1004 0
16 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 951 0
17 GUM 26 HII 09 24 30.1 -51 59 07           ~ 45 0
18 GAL 282.03-01.18 HII 10 06 37.5 -57 12 11           ~ 18 0
19 GUM 29 HII 10 24 14.6 -57 46 58           ~ 219 0
20 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 351 0
21 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
22 PMN J1056-6005 HII 10 56 30.4 -60 05 52           ~ 8 0
23 NGC 3576 HII 11 11 53.2 -61 18 26           ~ 245 2
24 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
25 IRAS 12073-6233 mul 12 10 00.4 -62 49 57           ~ 51 0
26 GAL 314.18+00.31 HII 14 24 48.6 -60 30 07           ~ 4 0
27 RAFGL 4972S cor 15 00 34.52760 -58 58 08.9076           ~ 51 1
28 OH 318.95-00.20 Y*O 15 00 55.35024 -58 58 53.2848           ~ 85 1
29 [KC97c] G319.2-00.4 HII 15 03 06.5 -59 03 27           ~ 8 0
30 [CH87] 319.874+0.770 HII 15 03 32 -57 40.1           ~ 10 0
31 IRAS 15384-5348 HII 15 42 17.787 -53 58 30.88           ~ 41 1
32 IRAS 15502-5302 HII 15 54 07.2 -53 11 20           ~ 51 0
33 PMN J1610-5206 HII 16 10 16.4 -52 06 28           ~ 8 0
34 GAL 331.386-00.359 HII 16 12 42 -51 45.0           ~ 2 0
35 GAL 333.1-00.4 Cl* 16 21 03.3 -50 36 19           ~ 33 1
36 GAL 334.71-00.67 HII 16 28 58 -49 36.5           ~ 9 0
37 [HBB99] 336.934-0.146 HII 16 35 48 -47 40.0           ~ 7 0
38 GAL 338.40+00.16 HII 16 40 14.2 -46 20 54           ~ 14 0
39 GAL 345.528-00.051 HII 17 06 08 -40 57.7           ~ 2 0
40 PMN J1803-2148 HII 18 02 59.4 -21 48 18           ~ 16 1
41 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
42 SNR G010.6-00.4 SNR 18 10 28 -19 55.8           ~ 58 0
43 W 31a Rad 18 10 28.3 -19 55 59           ~ 17 0
44 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
45 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 120 0
46 GAL 029.9-00.0 HII 18 46 08.0 -02 40 41           ~ 37 0
47 W 49a SFR 19 10 15.7 +09 06 05           ~ 325 2
48 GAL 048.60+00.04 HII 19 20 25.8 +13 55 25           ~ 17 0
49 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
50 [ARM2000] G070.293+01.601 Mas 20 01 45.73 +33 32 45.3           ~ 4 0
51 W 58a HII 20 01 45.8 +33 32 43           ~ 294 4
52 GAL 078.438+02.659 HII 20 19 39 +40 56.6           ~ 3 0
53 GRS G075.78 +00.34 HII 20 21 43.6 +37 26 36           ~ 19 0
54 [KCW94] 076.383-00.621 HII 20 27 26.767 +37 22 47.96           ~ 9 0
55 DR 7 HII 20 28 09.5 +40 51 43           ~ 49 0
56 GAL 081.679+00.537 HII 20 39 01 +42 19.5           ~ 3 0
57 SH 2-157 B HII 23 16 04 +60 02.1           ~ 12 0

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