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Title:
First NIR Polarimetry of 30 Doradus
Authors:
Nakajima, Yasushi; Kandori, Ryo; Tamura, Motohide; Kusakabe, Nobuhiko; Hashimoto, Jun; Nagayama, Takahiro; Nagata, Tetsuya; Hatano, Hirofumi; Kato, Daisuke; Hough, James H.
Affiliation:
AA(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; ) AB(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588) AC(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588) AD(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; Department of Astronomical Science, Graduate University for Advanced Studies (Sokendai), 2-21-1 Osawa, Mitaka, Tokyo 181-8588) AE(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588) AF(Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502) AG(Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502) AH(Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602) AI(Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602) AJ(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK
Publication:
Publications of the Astronomical Society of Japan, Vol.59, No.3, pp.519-525 (PASJ Homepage)
Publication Date:
06/2007
Origin:
PASJ
Keywords:
galaxies: Magellanic Clouds, infrared: ISM, ISM: magnetic fields, polarization
Abstract Copyright:
(c) 2007: Astronomical Society of Japan
Bibliographic Code:
2007PASJ...59..519N

Abstract

We have carried out the first near-infrared (NIR) polarimetric imaging observations of the central part (7'.7 × 7'.7 ˜ 110 pc} × 110 pc of 30 Doradus. The totals of 106, 131, and 34 sources have significant polarization degrees at J, H, and Ks, respectively. The E-vectors toward 30 Dor were mapped with unprecedentedly high resolutions. As previously noticed by optical observations, there is an overall tendency for the E-vectors to be roughly aligned in the east-west direction. In addition, our observations reveal a more complex structure of their alignment. The position angles of the E-vectors are not uniform, but show a gradual spatial variation. It is plausible to assume that they trace the magnetic field toward 30 Dor. One of the expanding shells toward 30 Dor, Shell 5, is clearly enveloped by E-vectors. The expanding shell has probably swept the magnetic field together into the rim, while creating the curved structure. We obtained the ratios of polarization degree among the NIR wavelengths: PH/PJ = 0.76±0.02 and PKs/PH = 0.87±0.06. These fit a power-law dependence of P ∝ λ-0.9.
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