用RATAN-600在4.7和8.2 GHz测量高红移耀变体PSO J047 .4478+27.2992
Flux-density measurements of the high-redshift blazar PSO J047.4478+27.2992 at 4.7 and 8.2 GHz with RATAN-600
摘要：
我们报告的第一次检测在4.7和8.2 GHz的RATAN-600射电望远镜的源PSO J047.4478+27.2992，这已被宣布为耀变体在z=6.1。平均通量密度在4.7和8.2 GHz下分别为$12\pm3$和$8\pm4$ mJy，并且在11.2 GHz下上限估计为3 mJy。在4.7 GHz的光变曲线，在四个月的时间尺度上获得的，表现出中等的源的可变性（分数可变性$F_{var}=0.28\pm0.02$）。新的RATAN-600测量将以前的文献数据扩展到更高的频率，表明$α_{0.147-8.2}$ = $-0.51\pm0.1$的单一幂律无线电频谱。4.7 GHz $P_ν \sim 2 \times 10^{27}$ W Hz $^{-1}$的单色射电光度与$z\geq 3$的高红移类星体的值一致。
英文摘要：
We report the first detection at 4.7 and 8.2 GHz with the RATAN-600 radio telescope of the source PSO J047.4478+27.2992, which has been announced as a blazar at z=6.1. The average flux density is $12\pm3$ and $8\pm4$ mJy at 4.7 and 8.2 GHz respectively, and an upper limit is estimated as 3 mJy at 11.2 GHz. The light curve at 4.7 GHz, obtained on a time-scale of four months, exhibits moderate variability of the source (fractional variability $F_{var}=0.28\pm0.02$). The new RATAN-600 measurements extend previous literature data to higher frequencies, indicating a single power-law radio spectrum with $α_{0.147-8.2}$=$-0.51\pm0.1$. The monochromatic radio luminosity at 4.7 GHz $P_ν \sim 2 \times 10^{27}$ W Hz$^{-1}$ is consistent with values for high-redshift quasars at $z\geq 3$.
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