Radio Polarization Properties for Blazars

Radio Polarization Properties for Blazars
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耀变体的射电偏振特性

DOI:
10.1093/pasj/60.4.707
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发表时间:
2008-08
影响因子:
2.3
通讯作者:
Zhang, Jing-Yi
Zhang, Jing-Yi
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Huang, Yong;Tao, Jun;Guo, Qian;Gupta, Alok G.;Yuan, Yu-Hai;Liu, Yi;Su, Jiang-Bo;Zhang, Jiang-Shui;Wang, Hong-Guang;Liu, Hua;Romero, Gustavo E.;Zhang, Yong-Wei;Hua, Tong-Xu;Fan, Jun-Hui;Zhang, Jing-Yi

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我们使用密歇根大学射电天文台(UMRAO)在三个不同频段(4.8 GHz,8 GHz和14.5 GHz)的数据来计算92个平谱射电类星体(FSRQ)样本的射电光谱指数和平均偏振。分析了这些天体的偏振态与其它物理参数之间的关系。结果表明:1)在高频率下的偏振及其变率高于低频率下的偏振及其变率,2)线偏振度与射电谱指数相关,表明射电辐射是由同步加速器机制引起的,3)对于已知核优势参数的天体,偏振度与核优势参数相关,这表明相对论聚束效应可以解释FSRQ的某些偏振特性; 4)偏振和通量密度变化是相关的。这些结果与我们先前工作中发现的RBL结果相似(Fan et al. 2006)。然而,FSRQ中的平均偏振和光谱指数的分布与RBL中的分布不同。
We used data from the University of Michigan Radio Astronomy Observatory (UMRAO) at three different bands (4.8 GHz, 8 GHz, and 14.5 GHz) to calculate the radio spectral index and the averaged polarization in a sample of 92 flat spectrum radio quasars (FSRQs). We analyzed the relationship between the polarization and other physical parameters for these objects. The results show that: 1) the polarization and its variability at high radio frequencies are higher than those at lower frequencies, 2) the degree of linear polarization is correlated with the radio spectral index, suggesting that the synchrotron mechanism is responsible for the radio emission, 3) the polarization is correlated with the core-dominance parameter for those objects for which this parameter is known, which suggests that relativistic beaming could explain some polarization characteristics of FSRQs, and 4) the polarization and flux density variabilities are correlated. These results are similar to those found for RBLs in our previous work (Fan et al. 2006). However, the distributions in the averaged polarization and the spectral index in FSRQs are different from those in RBLs.
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