发表机构
Seoul National University; SNU Astronomy Research Center, Seoul National University; Worcester State University; University of Illinois（首尔大学; 首尔大学天文研究中心; 伍斯特州立大学; 伊利诺伊大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过亚毫米偏振观测揭示L1527 IRS原恒星系统中磁场形态的东部垂直与西部收缩差异，结合谱指数和丝状结构，提出非对称质量分布驱动的吸积情景。
AI 中文摘要
磁场在调控稠密分子云坍缩、塑造原恒星演化的早期阶段中起着关键作用。我们展示了使用詹姆斯·克拉克·麦克斯韦望远镜上的 SCUBA-2/POL-2 仪器对 Class 0 原恒星系统 L1527 IRS（IRAS 04368+2557）进行的亚毫米波段的偏振观测。L1527 IRS 核心区的磁场形态各异。东部区域的磁场垂直于外流轴，而西部区域的磁场呈现收缩形态，整体上与外流腔对齐。这两个不同的双极外流区域在詹姆斯·韦伯太空望远镜的近红外观测中也显示出明显的颜色差异。此外，由 450 微米和 850 微米观测导出的谱指数表明，原恒星系统的西北区域比东南区域更冷、更致密。进一步地，在赫歇尔和普朗克卫星揭示的大尺度结构和磁场中，我们发现东部区域存在一个约 0.1 秒差距尺度、与大尺度磁场平行的丝状结构，而西部区域的质量分布相对各向同性。基于这些结果，我们提出了该原恒星系统的一种吸积情景，其中非对称的质量分布导致了在近红外和亚毫米波段观测到的显著特征。
英文摘要
Magnetic fields play a crucial role in regulating the collapse of dense molecular clouds, shaping the early stages of protostellar evolution. We present polarization observations in submillimeter wavelengths with the SCUBA-2/POL-2 instrument on James Clerk Maxwell Telescope toward the Class 0 protostellar system L1527 IRS (IRAS 04368+2557). The magnetic field morphology varies across the core of L1527 IRS. Magnetic fields in the eastern region are perpendicular to the outflow axis, while those in the western region show a pinched morphology, overall aligned with the outflow cavity. These distinct bipolar outflow regions also have a clear color difference in near infrared observed by James Webb Space Telescope. In addition, the spectral index derived from 450 μm and 850 μm observations reveals that the northwestern region of the protostellar system is colder and denser compared to the southeastern region. Furthermore, in the large-scale structures and magnetic fields revealed by Herschel and Planck, we find a ~0.1 pc scale filamentary structure parallel to the large-scale magnetic fields in the eastern region and a relatively isotropic mass distribution in the western region. Based on these results, we propose an accretion scenario of the protostellar system in which an asymmetric mass distribution causes the distinct features observed in near-infrared and submillimeter wavelengths.
Comments18 pages, 13 Figures, 1 table, Accepted for publication in ApJ
