基于AGN核心尺寸的多频VLBA观测的银河系散射特性研究

Proceedings of European VLBI Network Mini-Symposium and Users' Meeting 2021 — PoS(EVN2021) Pub Date : 2022-02-24 DOI:10.22323/1.399.0017

T. Koryukova, A. Pushkarev, A. Plavin, Y. Kovalev

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摘要

本文基于活动星系核(AGN)的多频(1.4 ~ 86 GHz)甚长基线干涉测量(VLBI)数据，对整个天空(天球极南纬区域除外)的银河系散射特性进行了分析。利用2 GHz和8 GHz两个频率的同时观测数据，以及AGN VLBI视在喷流源(核心)的非同时多频观测数据，推导出了非散射源和散射源的幂律指数特征值。我们构建了第一张详细的银河系射电发射散射功率的天空分布图，并分析了其性质。在银道面内，星核的散射尺寸明显更大|𝑏| < 10◦。

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A study of the Milky Way scattering properties based on multi-frequency VLBA observations of the AGN core sizes

We present the results on the analysis of scattering properties of the Galaxy, based on multi-frequency (1.4 – 86 GHz) Very Long Baseline Interferometry (VLBI) data of active galactic nuclei (AGN) over the entire sky, with the exception of the region of far southern latitudes of the celestial sphere. The data of simultaneous observations at two frequencies, 2 and 8 GHz, and non-simultaneous multi-frequency observations of the apparent AGN VLBI jet origin (the core), allowed us to derive the characteristic value of the power-law index for the unscattered and scattered sources. We constructed the first detailed sky distribution map of the radio emission scattering power in the Galaxy and analyzed its properties. The scattered sizes of the cores are found to be significantly larger within the Galactic plane | 𝑏 | < 10 ◦ .

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Proceedings of European VLBI Network Mini-Symposium and Users' Meeting 2021 — PoS(EVN2021)

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