2015ApJ...802...40L

Query : 2015ApJ...802...40L

2015ApJ...802...40L - Astrophys. J., 802, 40 (2015/March-3)

Sulfur-bearing molecules in massive star-forming regions: observations of OCS, CS, H2S, and SO.

LI J., WANG J., ZHU Q., ZHANG J. and LI D.

Abstract (from CDS):

We studied the sulfur chemistry of massive star-forming regions through single-dish submillimeter spectroscopy. OCS, O13CS, 13CS, H2S, and SO transitions were observed toward a sample of massive star-forming regions with embedded UCH ii or CH ii regions. These sources could be divided into H ii-hot core and H ii-only sources based on their CH3 CN emission. Our results show that the OCS line of thirteen sources is optically thick, with optical depth ranging from 5 to 16. Column densities of these molecules were computed under LTE conditions. CS column densities were also derived using its optically thin isotopologue 13CS. H2S is likely to be the most abundant gas-phase sulfuretted molecule in hot massive cores. Both the column density and abundance of sulfur-bearing molecules decrease significantly from H ii-hot core to H ii-only sources. Ages derived from hot core models appear to be consistent with star formation theories, suggesting that abundance ratios of [CS]/[SO], [SO]/[OCS], and [OCS]/[CS] could be used as chemical clocks in massive star-forming regions.

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Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules - molecular processes - radio lines: ISM

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3336 2
2 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1028 2
3 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2294 1
4 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 202 0
5 RCW 142 HII 17 50 15.3 -28 54 03           ~ 63 0
6 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 362 0
7 RAFGL 2059 Y*O 18 04 53.1586569336 -24 26 41.642012796 19.905 21.910 18.914   14.078 ~ 144 0
8 RAFGL 5436 HII 18 06 19.027 -21 37 32.32           ~ 98 0
9 W 31 SFR 18 10 28.6 -19 55 51           ~ 261 0
10 W 31c HII 18 10 29.1 -19 56 05           ~ 341 0
11 CORNISH G011.9368-00.6158 HII 18 14 01.0 -18 53 23           ~ 82 1
12 [DS77] W 33 IRS 3 IR 18 14 13.5 -17 55 42           ~ 8 0
13 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 257 0
14 [DS77] W 33 IRS 2 IR 18 14 14.4 -17 55 22           ~ 7 0
15 [DS77] W 33 IRS 1 IR 18 14 15.0 -17 55 58           ~ 6 0
16 GAL 014.33-00.64 HII 18 18 53.5 -16 47 39           ~ 65 0
17 GRS G024.80 +00.10 SFR 18 38 14.8 -06 47 39           ~ 113 0
18 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 365 0
19 GAL 030.54+00.02 HII 18 46 59.1 -02 07 32           ~ 12 0
20 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 117 1
21 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 505 0
22 SH 2-76 E SFR 18 56 12 +07 53.4           ~ 35 0
23 GAL 035.2-00.74 cor 18 58 13.00 +01 40 36.0           ~ 170 0
24 GAL 037.55-00.11 HII 19 00 16.02 +04 03 15.1           ~ 40 0
25 GAL 035.20-01.74 Y*O 19 01 46.49 +01 13 24.7           ~ 75 1
26 CORNISH G045.4545+00.0591 HII 19 14 21.31 +11 09 11.7           ~ 154 1
27 GAL 043.89-00.78 HII 19 14 26.16 +09 22 34.0           ~ 51 0
28 [WBN74] W 51 IRS 2 PCG 19 23 39.93 +14 31 09.4           ~ 293 0
29 W 51m Rad 19 23.7 +14 30           ~ 61 0
30 SH 2-88 B HII 19 46 48.2 +25 12 21           ~ 158 2
31 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 80 0
32 GAL 078.4+02.6 HII 20 19 39.22 +40 56 36.6           ~ 14 0
33 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 401 1
34 NAME DR 21 S IR 20 39 00.7 +42 19 15           ~ 13 0
35 W 75(OH) Rad 20 39 01.01 +42 22 49.9           ~ 39 0
36 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1055 0
37 NAME NGC 7129 FIR 2 IR 21 44 01.5 +66 03 40           ~ 98 0
38 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 741 2
39 NGC 7538 OpC 23 13 37 +61 30.0           ~ 881 1
40 SH 2-158 A HII 23 13 45.580 +61 28 18.02           ~ 12 0

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