Radio Monitoring and High-Resolution Imaging of extreme Blazars and other TeV-Detected Active Galaxies with the Effelsberg 100-m Telescope and the Global Millimetre VLBI Array

使用 Effelsberg 100 米望远镜和全球毫米级 VLBI 阵列对极端耀变体和其他 TeV 探测到的活动星系进行无线电监测和高分辨率成像

• 批准号: 465409577
• 负责人: Professor Dr. Matthias Kadler
• 金额: --
• 依托单位: Max-Planck-Institut für Radioastronomie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/465409577?language=en
• 关键词: Radio; Monitoring; Resolution; Imaging; extreme

Extreme blazars represent a sub-class of active galaxies with collimated relativistic plasma jets, whose emission maxima range to higher energies by several orders of magnitude as compared to 'regular' blazars, reaching far into the TeV gamma-ray regime. Although only a small number of extreme blazars is known today, it is clear that they represent a numerous class of objects of high relevance for the upcoming decade of research in high-energy astronomy and astropartiale physics. Extreme blazars are of particular interest in the context of the still not understood sources of ultrahigh-energy cosmic rays and their associated processes of extreme particle acceleration, as well as possible sources of high-energy astrophysical neutrinos. The radio regime offers unprecedented possibilities of high angular-resolution imaging and high-sensitivity spectral flux-density studies to probe the structure and dynamical processes in such relativistic plasma jets. The radio emission of extreme blazars is comparatively faint and not yet well studied. In this project, we will combine a new long-term spectral monitoring program of TeV-blazars using the Effelsberg 100-m radio telescope with a radio-interferometric high-resolution imaging study of a sample of extreme blazars with the global Millimeter VLBI Array (GMVA). The Effelsberg program will characterize the radio variability properties of TeV blazars and their faint polarized emission, providing data to determine their dynamic broadband emission from the radio to the TeV-gamma regime. This will allow us to constrain the site of origin of the TeV gamma-ray emission. The GMVA observations will provide sub-parsec-scale details on characteristic structures such as jet limb brightening, predicted by gamma-ray emission models, and will yield a systematic study of brightness temperatures, core spectra and jet velocities on the most compact scales of the jets that are accessible via mm-VLBI, ultimately comparing extreme blazars with other classes of TeV-emitting blazars.

极端耀变体代表了一个活跃星系的子类与准直相对论等离子体射流，其发射最大值范围更高的能量由几个数量级相比，“常规”耀变体，远远达到TeV的伽马射线制度。尽管今天只知道少数极端耀变体，但很明显，它们代表了众多与即将到来的高能天文学和天体物理学研究十年高度相关的天体。极端耀变体在超高能宇宙射线的来源及其相关的极端粒子加速过程以及高能天体物理中微子的可能来源仍然不为人所知的背景下特别感兴趣。无线电制度提供了前所未有的高角度分辨率成像和高灵敏度光谱通量密度研究的可能性，以探测这种相对论等离子体射流的结构和动力学过程。极端耀变体的射电辐射相对较弱，尚未得到很好的研究。在这个项目中，我们将结合联合收割机的TeV耀变体的一个新的长期光谱监测计划，使用Effelsberg 100米射电望远镜与无线电干涉高分辨率成像研究的极端耀变体的样本与全球毫米VLBI阵列（GMVA）。Effelsberg计划将描述TeV耀变体的射电变率特性及其微弱的偏振发射，提供数据以确定其从射电到TeV-伽马区域的动态宽带发射。 这将使我们能够限制TeV伽马射线发射的起源位置。 GMVA观测将提供亚秒差距尺度的特征结构细节，如喷流临边增亮，由伽马射线发射模型预测，并将产生一个系统的研究亮度温度，核心光谱和喷流速度的最紧凑的规模的喷流，可通过毫米VLBI，最终比较极端耀变体与其他类的TeV发射耀变体。