• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of modern physics, D. Gravitation, astrophysics, cosmology >THE PARSEC-SCALE CIRCULAR POLARIZATION OF ACTIVE GALACTIC NUCLEI AT 22 AND 15 GHZ
【24h】

THE PARSEC-SCALE CIRCULAR POLARIZATION OF ACTIVE GALACTIC NUCLEI AT 22 AND 15 GHZ

机译：GHZ在22和15时的准尺度圆极化。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present the results of parsec-scale circular polarization measurements based on Very Long Baseline Array data for a number of radio-bright, core-dominated active galactic nuclei obtained simultaneously at 22 and 15 GHz. The degrees of circular polarization m(c) for the VLBI core region at 15 GHz are similar to values reported earlier at this wavelength, with typical values of a few tenths of a percent. The origin of this polarization is almost certainly the conversion of linear to circular polarization during the propagation of the radiation through a magnetised plasma. We find that m(c) is as often higher as lower at the higher frequency, for reasons that are not clear. Our results confirm the earlier finding that the sign of the circular polarization at a given observing frequency is generally consistent across epochs separated by several years or more, suggesting stability of the magnetic field orientation in the innermost jets.
机译：我们介绍了基于甚长基线阵列数据的视差级圆极化测量的结果，这些数据是同时在22 GHz和15 GHz下获得的许多无线电波明亮的，以核为主的有源银河核。 VLBI核心区域在15 GHz时的圆偏振度m（c）与该波长下较早报道的值相似，典型值为百分之十分之一。这种极化的根源几乎可以肯定是在辐射通过磁化等离子体的传播过程中线性极化到圆极化的转换。我们发现，由于不清楚的原因，在较高的频率下，m（c）通常较高而较低。我们的结果证实了较早的发现，即在给定的观察频率下，圆极化的符号在相隔数年或更长时间的各个时期通常是一致的，这表明最内侧射流中磁场方向的稳定性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号