Methylamine and other simple N-bearing species in the hot cores NGC 6334I MM1–3

摘要: Context. In the search for building blocks of life, nitrogen-bearing molecules are particular interest since nitrogen-containing bonds essential linking amino acids and ultimately formation larger biological structures. The elusive molecule methylamine (CH3NH2) is thought to be a key pre-biotic species but has so far only been securely detected in giant molecular cloud Sagittarius B2. Aims. We identify CH3NH2 other simple involved synthesis biologically relevant towards three hot cores associated with high-mass star-forming region NGC 6334I, located at distance 1.3 kpc. Column density ratios derived order investigate relevance individual as precursors biotic molecules. Methods. High sensitivity, high angular spectral resolution observations obtained Atacama Large Millimeter/ submillimeter Array were used study transitions CH3NH2, CH2NH, NH2CHO, 13C- 15N-methyl cyanide (CH3CN) isotopologues, 6334I. densities each assuming local thermodynamic equilibrium excitation temperatures range 220–340 K 70–110 CH3CN isotopologues 120–215 NH2CHO CH2NH. Results. report first detections 6334I column respect CH3OH 5.9 × 10−3, 1.5 10−3 5.4 10−4 MM1, MM2, MM3, respectively. These values slightly lower than B2 higher by more an magnitude compared low-mass protostar IRAS 16293–2422B. 13CH3CN, CH3C15N (1.5 – 1.9) 10−4, (1.0 4.6) (1.7 3.0) Lower limits 5.2, 1.2, 3.0 reported CH2NH ratio MM3 largely consistent those Conclusions. hint that generally common interstellar medium, albeit high-sensitivity forthe detection species. good agreement between model predictions indicate main pathway via radical recombination on grain surfaces. This process may stimulated further allowing lager degree mobility. Further ALMA will help evaluate which chemistry depends temperature grains high- regions