利用α-F环分析Blazar 3C454.3的长周期光变

Analysis on the long-term periodicity of Blazar 3C454.3 by α-F circle

通过研究辐射谱和流量密度之间的关系,可以分析与辐射有关的辐射过程以及其中蕴含的辐射理论.文章利用UMRAO(美国密歇根大学射电天文台)数据库,从中挑选了1个具有比较多观测数据的源——3C454.3.利用该源的流量密度(F),计算了对应的谱指数(α),得到α的范围为-0.339±0.038至0.517±0.013,平均值为珔α=0.171±0.217.流量密度和谱指数之间存在比较强的反相关:α=(-0.057±0.004)F14.5+0.758±0.039,相互系数为r=-0.778,差异概率P<0.01.在流量密度和谱指数的分布中存在着2个比较明显的椭圆环结构,其时间跨度分别为5.82 a和6.71 a,该时间跨度与源的长周期光变时标是一致的.

In the radio band, the relationship between the emission spectrum （a） and flux density （F） can demonstrate the emission theory and process. In this paper, we chose a Blazar with enough data from UMRAO （ the University of Michigan Radio Observatory） to calculate the spectrum （a） and flux density （F）. We ob- tained 162 spectral indices （a）, which come from -0. 339 ±0. 038 to 0. 517 ±0. 013, with the average value =0. 171 ±0. 217. There were anti -correlations between a and F： a= （ -0. 057 ± 0. 004）F145 ± 0. 758 ± 0. 039, with the correlation coefficient r = -0. 778, the chance P 〈 0. 01%. There are two obvious elliptic curves lie in the distributions between a and F; the time spans of two elliptic curves were 5.82 years and 6. 71 years ; The time spans of the elliptic curves are consistent with the long - term periodicity optical variability.