2015A&A...576A..35L


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET03:01:16

2015A&A...576A..35L - Astronomy and Astrophysics, volume 576A, 35-35 (2015/4-1)

Search for methylamine in high mass hot cores.

LIGTERINK N.F.W., TENENBAUM E.D. and VAN DISHOECK E.F.

Abstract (from CDS):

We aim to detect methylamine, CH3NH2, in a variety of hot cores and use it as a test for the importance of photon-induced chemistry in ice mantles and mobility of radicals. Specifically, CH3NH2 cannot be formed from atom addition to CO whereas other NH2-containing molecules such as formamide, NH2CHO, can. Submillimeter spectra of several massive hot core regions were taken with the James Clerk Maxwell Telescope (JCMT). Abundances are determined with the rotational diagram method where possible. Methylamine is not detected, giving upper limit column densities between 1.9-6.4x1016cmi–2 for source sizes corresponding to the 100 K envelope radius. Combined with previously obtained JCMT data analysed in the same way, abundance ratios of CH3NH2, NH2CHO and CH3CN with respect to each other and to CH3OH are determined. These ratios are compared with Sagittarius B2 observations, where all species are detected, and to hot core models. The observed ratios suggest that both methylamine and formamide are overproduced by up to an order of magnitude in hot core models. Acetonitrile is however underproduced. The proposed chemical schemes leading to these molecules are discussed and reactions that need further laboratory studies are identified. The upper limits obtained in this paper can be used to guide future observations, especially with ALMA.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - methods: observational - stars: formation - ISM: abundances - ISM: molecules

Simbad objects: 18

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Number of rows : 18

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 W 3(H2O) Mas 02 27 04.6 +61 52 25           ~ 114 0
2 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 120 0
3 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 171 0
4 NAME Ori A MoC 05 38 -07.1           ~ 2619 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3293 3
6 NAME Sgr B2N Mas 17 47 20.0 -28 22 40           ~ 29 1
7 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 500 1
8 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1
9 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 326 1
10 GRS G012.89 +00.49 HII 18 11 51.3 -17 31 29           ~ 143 0
11 W 33a Y*O 18 14 39.0 -17 52 03           ~ 571 0
12 [FCC2002] A1 Y*O 18 36 12.6 -07 12 11           ~ 28 0
13 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 295 0
14 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 389 0
15 NAME Cygnus 2N HII 20 21 44.1 +37 26 40           ~ 108 1
16 RAFGL 2591 Y*O 20 29 25.2650 +40 11 26.532   18       ~ 561 5
17 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 360 3
18 [WBN74] NGC 7538 IRS 9 Y*O 23 14 01.63 +61 27 20.2           ~ 336 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-03:01:16

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