MAGNETIC FIELD CONFIGURATION AT THE GALACTIC CENTER INVESTIGATED BY WIDE-FIELD NEAR-INFRARED POLARIMETRY: TRANSITION FROM A TOROIDAL TO A POLOIDAL MAGNETIC FIELD
MAGNETIC FIELD CONFIGURATION AT THE GALACTIC CENTER INVESTIGATED BY WIDE-FIELD NEAR-INFRARED POLARIMETRY: TRANSITION FROM A TOROIDAL TO A POLOIDAL MAGNETIC FIELD
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DOI：
10.1088/0004-637x/690/2/1648
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
S. Nishiyama;H. Hatano;M. Tamura;N. Matsunaga;T. Yoshikawa;T. Suenaga;J. Hough;K. Sugitani;T. Nagayama;D. Kato;T. Nagata
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作者：
S. Nishiyama;H. Hatano;M. Tamura;N. Matsunaga;T. Yoshikawa;T. Suenaga;J. Hough;K. Sugitani;T. Nagayama;D. Kato;T. Nagata
我们提出了一个大尺度的磁场（MF）在中央2° × 2°区域的银河系。点源的偏振已被测量在J，H和KS波段使用近红外偏振相机SIRPOL的1.4米红外测量设施望远镜。比较高消光恒星和相对低消光恒星之间的斯托克斯参数，我们得到的偏振起源于磁性对齐的尘埃颗粒在我们的银河系中央几百秒差距。我们发现，在银道面附近，MF几乎平行于银道面（即，环形配置），但在高银河系纬度（B θ> 0.4 °），磁场几乎垂直于平面（即，极向配置）。这是第一次检测到一个大规模的MF配置在这个区域的平滑过渡。
We present a large-scale view of the magnetic field (MF) in the central 2° × 2° region of our Galaxy. The polarization of point sources has been measured in the J, H, and KS bands using the near-infrared polarimetric camera SIRPOL on the 1.4 m Infrared Survey Facility telescope. Comparing the Stokes parameters between high extinction stars and relatively low extinction ones, we obtain polarization originating from magnetically aligned dust grains in the central few hundred parsecs of our Galaxy. We find that near the Galactic plane, the MF is almost parallel to the Galactic plane (i.e., toroidal configuration), but at high Galactic latitudes (∣b ∣ >0.°4) the field is nearly perpendicular to the plane (i.e., poloidal configuration). This is the first detection of a smooth transition of the large-scale MF configuration in this region.