Complex Molecules in the Hot Core of the Low-Mass Protostar NGC 1333 IRAS 4A

摘要: We report the detection of complex molecules (HCOOCH3, HCOOH, and CH3CN), signposts a hot core-like region, toward low-mass Class 0 source NGC 1333 IRAS 4A. This is second protostar in which such have been searched for reported, other being 16293-2422. It therefore likely that compact (a few tens AU) regions dense warm gas, where chemistry dominated by evaporation grain mantles are found, common sources. Given chemical formation timescale much shorter than gas hot-core crossing time, it not clear whether reported formed on surfaces (first-generation molecules) or reactions involving evaporated mantle constituents (second-generation molecules). do find evidence large differences molecular abundances, normalized to formaldehyde abundance, between two solar-type protostars, suggesting perhaps origin.