2023ApJ...954..189S

Query : 2023ApJ...954..189S

2023ApJ...954..189S - Astrophys. J., 954, 189 (2023/September-2)

Survey of CH3NH2 and its Formation Process.

SUZUKI T., MAJUMDAR L., GOLDSMITH P.F., TOKUDA K., MINAMOTO H., OHISHI M., SAITO M., HIROTA T., NOMURA H. and OYA Y.

Abstract (from CDS):

We present the observational results of a precursor of glycine, methylamine (CH3NH2), together with methanol (CH3OH) and methanimine (CH2NH) for the high-mass star-forming regions NGC 6334I, G10.47+0.03, G31.41+0.3, and W51 e1/e2 using the Atacama Large Millimeter/submillimeter Array. The molecular abundances of these sources were derived using the CASSIS spectrum analyzer and compared with our state-of-the-art three-phase chemical model NAUTILUS. We found that the observed abundance ratio of CH3NH2/CH3OH is between 0.008 and 1.0 for all sources, except for NGC 6334I MM3, where a ratio less than 0.002 is found. This may be due to its later evolutionary stage relative to the other cores. We also found that the observed CH3NH2/CH3OH ratio agrees well with the three-phase chemical model NAUTILUS, which includes the formation of CH3NH2 on the grain surface via a series of hydrogenation processes of HCN. This result clearly shows the importance of hydrogenation processes to form CH3NH2.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Astrochemistry - Interstellar medium - Interstellar molecules - Interstellar abundances - Star formation

Simbad objects: 43

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Number of rows : 43
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 LDN 1389 MoC 04 04 38 +56 56.2           ~ 99 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
3 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 212 0
4 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 799 1
5 PKS 1613-586 rG 16 17 17.89125660 -58 48 07.8601409   18.23       ~ 156 1
6 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
7 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 352 0
8 [HBM2006b] I-SMA4 mm 17 20 53.099 -35 47 03.32           ~ 18 0
9 [BHC2016] MM6 mm 17 20 53.122 -35 47 02.80           ~ 4 0
10 [BHC2016] MM2 mm 17 20 53.188 -35 46 59.32           ~ 47 0
11 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 373 0
12 [BHC2016] CM2 Rad 17 20 53.384 -35 46 55.68           ~ 12 0
13 [BHC2016] MM1 cor 17 20 53.415 -35 46 57.88           ~ 121 0
14 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
15 [BHC2016] MM7 cor 17 20 53.641 -35 46 54.83           ~ 6 0
16 [BHC2016] MM9 cor 17 20 53.896 -35 46 59.10           ~ 6 0
17 PMN J1733-3722 Rad 17 33 15.1930935 -37 22 32.398009           ~ 56 1
18 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
19 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 742 1
20 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
21 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 436 1
22 NAME Sgr B2 (OH) MoC 17 47 20.8 -28 23 32           ~ 91 0
23 GCM +0.693 -0.027 MoC 17 47 21.9 -28 21 27           ~ 128 0
24 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
25 GAL 010.46+00.03 HII 18 08 35.5 -19 52 09           ~ 59 0
26 [WC89] 010.47+0.03B2 HII 18 08 38.22 -19 51 50.5           ~ 8 0
27 [WC89] 010.47+0.03B1 HII 18 08 38.25 -19 51 50.1           ~ 9 0
28 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 159 0
29 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
30 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 162 0
31 NVSS J183211-203947 BLL 18 32 11.0455806144 -20 39 48.210054948   18.56 20.2     ~ 75 1
32 IRAS 18324-0737 mm 18 35 08.1 -07 35 04           ~ 23 0
33 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
34 QSO J1851+005 QSO 18 51 46.72295 +00 35 32.3649           ~ 138 1
35 [HBM2005] G34.256+0.155 HII 18 53 18.5 +01 14 57           ~ 12 0
36 NVSS J192234+153010 Rad 19 22 34.69936025 +15 30 10.0326112           ~ 66 1
37 W 51e1 HII 19 23 43.785 +14 30 26.11           ~ 141 0
38 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 222 0
39 W 51e8 HII 19 23 44.2 +14 30 28           ~ 41 0
40 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
41 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 918 1
42 QSO B1958-179 Bla 20 00 57.09043927 -17 48 57.6726139   18.02 18.60 15.33   ~ 288 1
43 DR 21 (OH) cor 20 39 01.01 +42 22 50.2           ~ 427 0

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