Relative alignment between gas structures and magnetic field in Orion A at different scales using different molecular gas tracers

被引：2

作者：

Jiao, Wenyu ^{[1
,2
,3
]}

Wang, Ke ^{[2
]}

Xu, Fengwei ^{[1
,2
]}

Wang, Chao ^{[4
]}

Beuther, Henrik ^{[3
]}

机构：

[1] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China

[2] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[3] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[4] Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 686卷

基金：

美国国家科学基金会;

关键词：

ISM: magnetic fields; ISM: molecules; ISM: structure; STAR-FORMATION; NONHOMOLOGOUS CONTRACTION; PHYSICAL-PROPERTIES; VELOCITY-GRADIENTS; INTERCLOUD MEDIUM; CLOUD; DUST; OMC-2; ORIENTATION; POLARIMETRY;

D O I：

10.1051/0004-6361/202449182

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Magnetic fields can play a crucial role in high-mass star formation. Nonetheless, the significance of magnetic fields at various scales and their relationship with gas structures have been largely overlooked. Aims. Our goal is to examine the relationship between the magnetic field and molecular gas structures within the Orion A giant molecular cloud at different scales and density regimes. Methods. We assessed the gas intensity structures and column densities in Orion A using (CO)-C-12, (CO)-C-13, and (CO)-O-18 from Nobeyama observations. By comparing Nobeyama observations with Planck polarization observations on large scales (similar to 0.6 pc) and JCMT polarization observations on small scales (similar to 0.04 pc), we investigate how the role of magnetic fields changes with scale and density. Results. We find a similar trend from parallel to perpendicular alignment with increasing column density in Orion A at both large and small spatial scales. In addition, when changing from low-density to high-density tracers, the relative orientation preference changes from random to perpendicular. The self-similar results at different scales indicate that magnetic fields are dynamically important in both cloud formation and filament formation. However, magnetic field properties at small scales are relative complicated, and the interplay between magnetic field and star-forming activity needs to be discussed case by case.

引用

页数：12

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