Near-infrared imaging polarimetry toward M 17 SWex

被引：15

作者：

Sugitani, Koji ^{[1
]}

Nakamura, Fumitaka ^{[2
]}

Shimoikura, Tomomi ^{[3
]}

Dobashi, Kazuhito ^{[3
]}

Nguyen-Luong, Quang ^{[1
,4
]}

Kusune, Takayoshi ^{[2
]}

Nagayama, Takahiro ^{[5
]}

Watanabe, Makoto ^{[6
]}

Nishiyama, Shogo ^{[7
]}

Tamura, Motohide ^{[2
,8
,9
]}

机构：

[1] Nagoya City Univ, Grad Sch Nat Sci, Mizuho Ku, Nagoya, Aichi 4678501, Japan

[2] Natl Astron Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[3] Tokyo Gakugei Univ, Dept Astron & Earth Sci, Koganei, Tokyo 1848501, Japan

[4] IBM Canada, 120 Bloor St East, Toronto, ON M4Y 1B7, Canada

[5] Kagoshima Univ, 1-21-35 Korimoto, Kagoshima 8900065, Japan

[6] Okayama Univ Sci, Dept Appl Phys, Kita Ku, 1-1 Ridai Cho, Okayama, Okayama 7000005, Japan

[7] Miyagi Univ Educ, Aoba Ku, 149 Aramaki Aza Aoba, Sendai, Miyagi 9800845, Japan

[8] Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[9] Astrobiol Ctr NINS, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2019年 / 71卷

基金：

新加坡国家研究基金会;

关键词：

ISM: clouds; ISM: magnetic fields; ISM: structure; polarization; stars: formation; MAGNETIC-FIELD STRUCTURE; INTERSTELLAR EXTINCTION LAW; STAR-FORMATION; MOLECULAR CLOUD; INSTABILITY; POLARIZATION; OUTFLOWS; SCUBA-2; SYSTEMS; JCMT;

D O I：

10.1093/pasj/psz072

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We conducted near-infrared (JHK(s)) imaging polarimetry toward the infrared dark cloud (IRDC) M 17 SWex, including almost all of the IRDC filaments as well as its outskirts, with the polarimeter SIRPOL on the IRSF 1.4 m telescope. We revealed the magnetic fields of M 17 SWex with our polarization-detected sources that were selected by some criteria based on their near-IR colors and the column densities toward them, which were derived from the Herschel data. The selected sources indicate not only that the ordered magnetic field is perpendicular to the cloud elongation as a whole, but also that at both ends of the elongated cloud the magnetic field appears to be bent toward its central part, i.e., a large-scale hourglass-shaped magnetic field perpendicular to the cloud elongation. In addition to this general trend, the elongations of the filamentary subregions within the dense parts of the cloud appear to be mostly perpendicular to their local magnetic fields, while the magnetic fields of the outskirts appear to follow the thin filaments that protrude from the dense parts. The magnetic strengths were estimated to be similar to 70-300 mu G in the subregions, of which the lengths and average number densities are similar to 3-9 pc and similar to 2-7 x 10(3) cm(-3), respectively, by the Davis-Chandrasekhar-Fermi method with the angular dispersion of our polarization data and the velocity dispersion derived from the (CO)-O-18 (J = 1-0) data obtained by the Nobeyama 45 m telescope. These field configurations and our magnetic stability analysis of the subregions imply that the magnetic field has controlled the formation/evolution of the M 17 SWex cloud.

引用

页数：21

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