Polarization of the Thermal Emission from the Dust Ring at the Center of the Galaxy
Polarization of the Thermal Emission from the Dust Ring at the Center of the Galaxy
复制标题
银河系中心尘埃环热发射的偏振
DOI：
10.1086/173336
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
L. Tao
中科院分区：
文献类型：
--
作者：
R. Hildebrand;J. Davidson;J. Dotson;D. Figer;G. Novak;S. Platt;L. Tao
我们给出了关于银河系中心尘埃环的远红外辐射偏振的新结果。以前对该区域的远红外偏振测量仅限于发射的主脊。新的测量覆盖了环的整个区域。对于具有双轴对称性的磁场计算的极化图不能与数据拟合。为轴对称场计算的映射提供了更好的拟合，但结果表明，环和场不可能都具有理想的对称性。根据Wardle&Konigl(1990)的自相似模型计算的测量位置角对方向的离散度与在最有序的暗云中观测到的平均值的离散度相当
We present new results on the polarization of the far-infrared emission from the dust ring at the center of the Galaxy. Previous far-infrared polarimetry of the region has been confined to the main ridge of emission. The new measurements cover the entire area of the ring. Polarization maps computed for magnetic fields with biaxial symmetry cannot be made to fit the data. Maps computed for axisymmetric fields provide much better fits, but the results show that the ring and field cannot both have ideal symmetry. The dispersion of the measured position angles about the directions computed from the self-similar model of Wardle & Konigl (1990) is comparable to the dispersion about mean values observed in the most orderly dark clouds