RadioAstron Blazar的星际闪烁监测
Interstellar Scintillation Monitoring of the RadioAstron Blazars
摘要：
射电天文空间射电望远镜提供了一个独特的机会，研究极端亮度温度（$\mathrm{T_B }$）在活动星系核与前所未有的长基线高达28个地球直径。由于星际闪烁（ISS）可能影响空间VLBI（sVLBI）观测到的辐射，因此在VLBI观测时间附近对射电天文目标进行补充性地面通量密度监测可能是有益的。与sVLBI数据的结合/比较有助于揭示源固有效应和ISS诱导效应的相对影响，这最终可能改变sVLBI的$\mathrm{T_B }$测量结果。自2013年以来，一直在进行一项专门的监测方案，用一些射电望远镜观测国际空间站的射电天文活动星系核目标。在这里，我们简要介绍了程序和目前的结果，从统计分析的Effelsberg监测数据。作为一个案例研究，我们讨论了ISS对RadioAstron目标B0529 + 483的$\mathrm{T_B }$测量的可能影响。
英文摘要：
The RadioAstron space radio telescope provides a unique opportunity to study the extreme brightness temperatures ($\mathrm{T_B }$) in AGNs with unprecedented long baselines of up to 28 Earth diameters. Since interstellar scintillation (ISS) may affect the visibilities observed with space VLBI (sVLBI), a complementary ground based flux density monitoring of the RadioAstron targets, which is performed near in time to the VLBI observation, could be beneficial. The combination/comparison with the sVLBI data can help to unravel the relative influence of source intrinsic and ISS induced effects, which in the end may alter the conclusions on the $\mathrm{T_B }$ measurements from sVLBI. Since 2013, a dedicated monitoring program has been ongoing to observe the ISS of RadioAstron AGN targets with a number of radio telescopes. Here we briefly introduce the program and present results from the statistical analysis of the Effelsberg monitoring data. We discuss the possible effects of ISS on $\mathrm{T_B }$ measurements for the RadioAstron target B0529+483 as a case study.
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