會徽Logo
名稱Title
2021天文年會
國立嘉義大學蘭潭校區
5月21日至23日

論文摘要

A Study of Complex Organic Molecules in Protostellar Cores through the ALMA Survey of Orion PGCCs (ALMASOP)

[ Poster ]

Shih-Ying Hsu (ASIAA); Sheng-Yuan Liu (ASIAA); ALMASOP Collaboration

Hot corino sources, which are low- and intermediate-mass star-forming regions (SFRs) harboring warm, compact, and abundant complex organic molecules (COMs), have been studied for nearly two decades. It remains unclear, however, how the COMs correlate to the star formation process. We present the investigation of COMs toward protostellar cores as a part of ALMASOP, a survey of early-stage SFRs in the Orion cloud complex. We report 11 hot corino sources based on the observation of methanol (CH3OH), which is the simplest COMs. There are more COMs, including 13CH3OH, CH2DOH, CH3OH, CH3CHO, HCOOCH3, C2H5OH, and a pre-biotic molecule NH2CHO, frequently detected. Assuming a 12C/13C ratio of CH3CN to be 70, the relation between CH3CN and CH3OH agrees to the relation toward Perseus cloud from the literature. The spectral energy distribution (SED) fitting result reveals that the 100 K boundaries are less than 100 AU, which is the typical size of a hot corino, at the midplane of these sources . This consistency agrees with the three-phase model of hot corino that the abundant COMs sublimate into the gas when the surroundings reaches 100 K. In addition, we see the strong correlation some of the molecular parameters and the YSO model parameters, such as the column density of CH3OH and the total luminosity