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タイトル: | Distortion of Magnetic Fields in a Starless Core II: 3D Magnetic Field Structure of FeSt 1-457 |
著者: | Kandori, Ryo Tamura, Motohide Tomisaka, Kohji Nakajima, Yasushi Kusakabe, Nobuhiko Kwon, Jungmi Nagayama, Takahiro Nagata, Tetsuya https://orcid.org/0000-0001-9264-9015 (unconfirmed) Tatematsu, Ken’ichi |
著者名の別形: | 長田, 哲也 |
キーワード: | dust, extinction ISM: magnetic fields polarization stars: formation |
発行日: | 20-Oct-2017 |
出版者: | American Astronomical Society |
誌名: | The Astrophysical Journal |
巻: | 848 |
論文番号: | 110 |
抄録: | Three-dimensional (3D) magnetic field information on molecular clouds and cores is important for revealing their kinematical stability (magnetic support) against gravity, which is fundamental for studying the initial conditions of star formation. In the present study, the 3D magnetic field structure of the dense starless core FeSt 1-457 is determined based on the near-infrared polarimetric observations of the dichroic polarization of background stars and simple 3D modeling. With an obtained angle of line-of-sight magnetic inclination axis θinc of 45° ± 10° and previously determined plane-of-sky magnetic field strength Bpol of 23.8 ± 12.1 mG, the total magnetic field strength for FeSt 1-457 is derived to be 33.7 ± 18.0 μG. The critical mass of FeSt 1-457, evaluated using both magnetic and thermal/turbulent support is Mcr = 3.70 ± 0.92 M☉, which is identical to the observed core mass, Mcore = 3.55 ± 0.75 M☉. We thus conclude that the stability of FeSt 1-457 is in a condition close to the critical state. Without infalling gas motion and no associated young stars, the core is regarded to be in the earliest stage of star formation, i.e., the stage just before the onset of dynamical collapse following the attainment of a supercritical condition. These properties could make FeSt 1-457 one of the best starless cores for future studies of the initial conditions of star formation. |
著作権等: | © 2017. The American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/245472 |
DOI(出版社版): | 10.3847/1538-4357/aa8d18 |
出現コレクション: | 学術雑誌掲載論文等 |
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