Survey Observations of a Possible Glycine Precursor, Methanimine (CH$_2$NH)

Abstract : We conducted survey observations of a glycine precursor, methanimine or methylenimine (CH$_2$NH), with the NRO 45 m telescope and the SMT telescope towards 12 high-mass and two low-mass star-forming regions in order to increase number of CH$_2$NH sources and to better understand the characteristics of CH2NH sources. As a result of our survey, CH$_2$NH was detected in eight sources, including four new sources. The estimated fractional abundances were ~10$^8$ in Orion KL and G10.47+0.03, while they were ~10$^9$ towards the other sources. Our hydrogen recombination line and past studies suggest that CH$_2$NH-rich sources have less evolved HII regions. The less destruction rates by UV flux from the central star would be contributed to the high CH$_2$NH abundances towards CH$_2$NH-rich sources. Our gas-grain chemical simulations suggest that CH$_2$NH is mostly formed in the gas-phase by neutral-neutral reactions rather than the product of thermal evaporation from the dust surfaces.
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Astrophysical Journal, American Astronomical Society, 2016, 825 (1), pp.id. 79. <10.3847/0004-637X/825/1/79>
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https://hal.archives-ouvertes.fr/hal-01323922
Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 31 mai 2016 - 13:42:14
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

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Taiki, Suzuki, Masatoshi, Ohishi, Tomoya, Hirota, Masao, Saito, Liton Majumdar, et al.. Survey Observations of a Possible Glycine Precursor, Methanimine (CH$_2$NH). Astrophysical Journal, American Astronomical Society, 2016, 825 (1), pp.id. 79. <10.3847/0004-637X/825/1/79>. <hal-01323922>

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