gamma-ray外展引力透镜JVAS B0218 +357的无线电跟踪
Radio follow-up of the gamma-ray flaring gravitational lens JVAS B0218+357
摘要：
本文介绍了对双像引力透镜耀变体JVAS B0218+357的多频甚长基线阵列（VLBA）监测观测结果。多历元观测开始于2012年费米望远镜上的大面积望远镜探测到伽马射线耀斑后不到一个月，并跨越了两个月的间隔。射电光变曲线并没有显示出任何显著的通量密度变化，这表明高能和低能发射之间没有明显的相关性。欧文斯谷射电天文台在15 GHz的长期监测数据也证实了这一行为。VLBA观测提供的毫角秒尺度的分辨率使我们能够分辨出两幅具有核心喷流结构的透镜耀变体图像。通过对多历元数据的分析，没有发现明显的形态变化，这表明负责伽马射线变化的区域位于活动星系核的核心，这是不透明的最高观测频率为22 GHz。
英文摘要：
We present results on multifrequency Very Long Baseline Array (VLBA) monitoring observations of the double-image gravitationally lensed blazar JVAS B0218+357. Multi-epoch observations started less than one month after the gamma-ray flare detected in 2012 by the Large Area Telescope on board Fermi, and spanned a 2-month interval. The radio light curves did not reveal any significant flux density variability, suggesting that no clear correlation between the high energy and low-energy emission is present. This behaviour was confirmed also by the long-term Owens Valley Radio Observatory monitoring data at 15 GHz. The milliarcsecond-scale resolution provided by the VLBA observations allowed us to resolve the two images of the lensed blazar, which have a core-jet structure. No significant morphological variation is found by the analysis of the multi-epoch data, suggesting that the region responsible for the gamma-ray variability is located in the core of the AGN, which is opaque up to the highest observing frequency of 22 GHz.
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