تقرير
Near-Infrared Polarimetry toward the Galactic Center
| العنوان: | Near-Infrared Polarimetry toward the Galactic Center |
|---|---|
| المؤلفون: | Nishiyama, Shogo, Tamura, Motohide, Hatano, Hirofumi, Kanai, Saori, Kurita, Mikio, Sato, Shuji, Nagata, Tetsuya |
| سنة النشر: | 2008 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | Near-infrared polarimetry of point sources reveals the presence of a toroidal magnetic field in the central 20' x 20' region of our Galaxy. Comparing the Stokes parameters between high extinction stars and relatively low extinction ones, we have obtained a polarization originating from magnetically aligned dust grains at the central region of our Galaxy of at most 1-2 kpc. The derived direction of the magnetic field is in good agreement with that obtained from far-infrared/submillimeter observations, which detect polarized thermal emission from dust in the molecular clouds at the Galactic center. Our results show that by subtracting foreground components, near-infrared polarimetry allows investigation of the magnetic field structure at the Galactic center. The distribution of the position angles shows a peak at around 20deg, nearly parallel to the direction of the Galactic plane, suggesting a toroidal magnetic configuration. Comment: 5 pages, 2 figures; to be published in: Astronomical Polarimetry 2008: Science from Small to Large Telescopes, ASP Conference Series. For higher resolution, see http://www.kusastro.kyoto-u.ac.jp/~shogo/papers/ProcAstroPol08Nishiyama.pdf |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/0809.4945 |
| رقم الأكسشن: | edsarx.0809.4945 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |