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2012-11

NEAR INFARED CIRCULAR POLARIZATION IMAGES OF NGC 6334 V / Association of Polar faculae with the Polar magnetic patches as observed by Hinode

[Speaker 1]
Jungmi Kwon
[Title]
NEAR INFARED CIRCULAR POLARIZATION IMAGES OF NGC 6334 V
[Abstract]
We present results from deep imaging polarimetry measurements of circularly and linearly polarized light towards the massive star forming region NGC 6334-V. These observations show high degrees of circular polarization (CP) in the Ks band of as much as 22 % with an asymmetric positive/negative pattern, measured in the infrared nebula associated with the outflow. The CP region is very extended (~80″ or 0.65 pc). Both the large CP and the extended size of the CP region are comparable to those seen in the Orion CP region. The CP pattern is shifted along the axial axis and such an asymmetry does not conform to the classical alternating symmetry seen in other objects and models.
The asymmetry may be a clue indicating the range of influence of a helical field. Three-dimensional Monte Carlo light-scattering models are used to show that this may occur with a scattering geometry, which contains a dusty envelope surrounding the accretion disk as well as aligned grains. The detection of the large and extended CP in this source and the Orion supports the CP origin of the biological homochirality on Earth.
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[Speaker 2]
Anjali John K
[Title]
Association of Polar faculae with the Polar magnetic patches as observed by Hinode
[Abstract]
The polar region of the Sun, as observed with Hinode SOT/SP is found to be covered by patches that harbour strong magnetic field and that the large unipolar patches with flux > 10^18 Mx determine the polarity of the polar fi eld. It is also observed that there are small
bipolar patches (< 1018Mx) with balanced flux in the polar region. The polar faculae, the small-scale bright magnetic structures observed at heliographic latitudes > 70 deg., have been considered as a good proxy for the polar magnetic fi eld. The aim of this study is to understand the magnetic properties of faculae, which are believed to be associated with the polar magnetic patches. We analysed data of the north polar region taken by the Hinode/SOT- spectropolarimeter (SP) in September 2007. There are patches without faculae and they outnumber those with faculae. Faculae are present in all the patches with flux > 10^19 Mx. Magnetic patches are not uniformly bright but contain smaller faculae inside. We find that a positive correlation exists between total flux and intensity of faculae within the magnetic patches and that the faculae intensity depends on cosine of the heliocentric angle .

総合研究大学院大学 天文科学専攻 特別公開 2012

今年も例年通り、総合研究大学院大学/天文科学専攻の特別公開が、国立天文台の特別公開に合わせ2012/10/26~27の期間、共同で開催されました。天文科学専攻に所属する約30名の学生は、それぞれの所属部署と総研大の両方で準備を進めながら、当日は”総研大生の研究ライフ2012″と言う企画運営に携わりました。当日はお子さんから10~20代の若者、お子さんの親御さん世代の30~40代、更にはお孫さんがいらっしゃる50~60代の方々と幅広い年齢層の方々が来場されました。企画中にアンケートを取った結果(アンケート集計人数は263人)、”大学院での生活がどのようなものなのか、日常・非日常で分けていて、とてもイメージがつきやすかったです。非日常で、色んな観測所で観測をしているのが印象に残りました“と言うコメントを頂き、学生らしさが出た企画が好評を博していました。また、”(総研大の)存在を初めて知ったので、何もかもが印象的でした“と言うコメントなども頂き、総研大と言う存在を初めて知った方も多くいらっしゃったようです。総研大のPRを兼ねている特別公開なので、企画が持っている目標が十二分に達成されたと言えそうです。一方で、所属部署と総研大企画のシフト調整が直前まで行われていなかったり、折角上手に出来ている動画の配置場所が悪かったりと、反省点も挙げられています。来年の企画立案の際にはこれらの反省を活かし、更に良いものにして貰えればと思います。

毎年好評の総研大企画の景品や会場の様子!
20121027a.jpg
クイズの景品は毎年豪華!
20121027b.jpg
学生の日常を紹介中!
20121027c.jpg
クイズに正解すると、景品が貰えます!

文責: 総合研究大学院大学 天文科学専攻 博士過程4年 坂井 伸行

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