关键词: 小质量恒星形成, 星际介质, 分子谱线

Abstract: Based on high-resolution observational data from the ALMA telescope at the 1.3 mm and 3 mm bands, we conducted a search and high-resolution study of low-mass star-forming systems within the massive star-forming region W51 IRS2. For the first time, a low-mass star-forming system CG1 was discovered in this region. Through continuum observations, the mass of the CG1 system, determined to be 1.4-4.2 M⊙, exhibits characteristic thermal radiation spectral indices (α=2-3.5). Using the MADCUBA software under the local thermodynamic equilibrium assumption, we successfully identified 17 interstellar molecular species in the spectral line data from both bands and precisely calculated physical parameters of gas temperature (245-579 K), column density (1015-1018 cm^-2), and relative abundance (10-9-10-6). This study revealed the physical and chemical properties of an isolated low-mass system within the massive star-forming region W51 IRS2 for the first time, providing critical observational evidence for theoretical research on star formation.

Key words: low-mass star formation, interstellar medium, molecular spectrum