molecules:ism:menh2 [CDMS classic documentation]

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===== On Methylamine, CH3NH2, in the ISM =====

N. Kaifu, M. Morimoto, K. Nagane, K. Akabane, T. Iguchi, and K. Takagi\\
reported on the\\
**[[https://ui.adsabs.harvard.edu/abs/1974ApJ...191L.135K|Detection of Interstellar Methylamine]]**\\
//Astrophys. J.// **191**, L135–L137 (1974).\\
They used the Mitaka 6 m telescope for the //a//-symmetry 5<sub>15</sub> – 5<sub>05</sub> transition near 73.0 GHz and the 11 m Kitt Peak telescope for the //s//-symmetry, 4<sub>14</sub> – 4<sub>04</sub> transition near 86.1 GHz to detect molecular emission from Sagittarius B2.\\
\\

At the same time,\\
N. Fourikis, K. Takagi, and M. Morimoto\\
reported on the\\
**[[https://ui.adsabs.harvard.edu/abs/1974ApJ...191L.139F|Detection of Interstellar Methylamine by its 2<sub>02</sub> – 1<sub>10</sub> //A<sub>a</sub>// State Transition]]**\\
//Astrophys. J.// **191**, L139–L141 (1974).\\
They used the Parkes 64 m telecope to detect the transition near 8.8 GHz in emission toward Sagittarius B2.\\
 \\

Both papers mentioned above reported also the detection toward the Orion A molecular cloud, however, these detections are incorrect, see e.g.\\
L. E. B. Johansson, C. Andersson, J. Elldér, P. Friberg, Å. Hjalmarson, B. Höglund, W. M. Irvine, H. Olofsson, and G. Rydbeck,\\
**[[https://ui.adsabs.harvard.edu/abs/1984A%26A...130..227J|Spectral scan of Orion A and IRC+10216 from 72 to 91 GHz]]**\\
//Astron. Astrophys.// **191**, L139–L141 (1974).\\
\\

T. Kamiński, K. M. Menten, R. Tylenda, A. Karakas, A. Belloche, and N. A. Patel\\
investigated the\\
**[[https://doi.org/10.1051/0004-6361/201731287|Organic Molecules, Ions, and Rare Isotopologues in the Remnant of the Stellar-merger Candidate, CK Vulpeculae (Nova 1670)]]**\\
//Astron. Astrophys.// **607**, Art. No. A78 (2017).\\
Methylamine was identified through several transitions covered by the IRAM 30 m and APEX 12 m telescopes.\\
\\

S. Zeng, I. Jiménez-Serra, V. M. Rivilla, S. Martín, J. Martín-Pintado, M. A. Requena-Torres, J. Armijos-Abendaño, D. Riquelme, and R. Aladro\\
carried out a study on\\
**[[https://doi.org/10.1093/mnras/sty1174|Complex Organic Molecules in the Galactic Centre: the N-bearing Family]]**\\
//Mon. Not. R. Astron. Soc.// **478**, 2962–2975 (2018).\\
They performed an unbiased molecular line survey of the quiescent molecular cloud G+0.693−0.03 using the GBT 100 m dish (12.7–15.5 GHz and sections of 18–27 GHz) and the IRAM 30 m dish (80–116, 128–176, and 240–272 GHz). The detected five lines of methylamine.\\
\\

E. G. Bøgelund, B. A. McGuire, M. R. Hogerheijde, E. F. van Dishoeck, and N. F. W. Ligterink\\
reported on\\
**[[https://doi.org/10.1051/0004-6361/201833676|Methylamine and other simple N-bearing species in the hot cores NGC 6334I MM1–3]]**\\
//Astron. Astrophys.// **624**, Art. No. A82 (2019).\\
The authors describe the first unambigous detection of methylamine outside of the Galactic center.\\
\\

P. Gyawali, R. A. Motiyenko, A. Belloche, I. Kleiner, V. V. Ilyushin, E. A. Alekseev, I. Gulaczyk and M. Kreglewski\\
described the\\
**[[https://doi.org/10.1051/0004-6361/202346518|Rotational Spectrum and Interstellar Detection of the First Torsionally Excited State of Methylamine]]**\\
//Astron. Astrophys.// **677**, Art. No. A65 (2023).\\
Five lines in //v//<sub>t</sub> = 1 were reported as blended or only slightly blended in addition to ten in //v//<sub>t</sub> = 0. The observational data are from the ReMoCA survey of Sagittarius B2(N) carried out with ALMA at 3 mm.\\
\\

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Contributor(s): H. S. P. Müller; 03, 2016; 06, 2019; 08, 2020; 03, 2023; 09, 2023.

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