Fermi Blazar天体的射电偏振研究

Study on radio polarization of Fermi Blazar objects

由于Blazar天体的高光度、高偏振、高红移等极端性特点,对Blazar天体的研究已成为现代天体物理学研究中最活跃的一个分支。本文选取了1744个射电源的坐标、红移、峰值频率、流量等参量,并使用matlab软件进行了数据分析。结论如下:BL Lac天体偏振分布跨度、偏振度的平均值与中值均比FSRQ和BCU的大。其中,BL Lac天体的偏振度的平均值和中值最大,FSRQ次之,BCU以及其他类型的最小;Fermi Blazar天体在不同尺度巡天中射电偏振的偏振角之间没有相关性;BL Lac天体与FSRQ的射电偏振之间具有一定的相关性,BCU和其他类别的Fermi Blazar天体的射电偏振之间没有相关性;在不同尺度的Fermi Blazar天体巡天中,同步辐射峰值频率低的天体,其射电偏振高,而同步辐射峰值频率高的天体,其射电偏振低。

Study on Blazar objects had become one of the most active branches in modern astrophysics on account of Blazar objects＇ high luminosity,high polarization and high red-shift. This article selected coordinate,red-shift,peak frequency,flux and so forth of 1744 radio sources,and did analysis on data by Matlab. The conclusions were as follows： polarization distribution span,mean value and median of polarization of BL Lacs were all larger than that of FSRQs and BCUs. Moreover,mean value and median of polarization of BL Lacs were the largest,which of FSRQs took second place,which of BCU and other types were the smallest; During different scales of surveys,there were no correlations among polarization angles of radio polarization of Fermi Blazars; Radio polarization degree of BL Lacs had some correlations with that of FSRQs. Radio polarization degree of BCUs had no correlations with that of other Fermi Blazars; During surveys of Fermi Blazars of different scales,we discovered that objects with lower synchrotron radiation peak frequency had a higher radio polarization. Similarly,objects with higher synchrotron radiation peak frequency had a lower radio polarization.