Understanding Blazar Jets - The OVRO 40-m Blazar Monitoring Program

了解 Blazar Jets - OVRO 40-m Blazar 监测计划

• 批准号: 2025713
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2025713
• 关键词: Understanding; Blazar; Jets; OVRO; 40

The project is centred round the radio monitoring of 1500 Blazars with the 40-m telescope at the Owens Valley Radio Observatory (OVRO, California, USA) and then producing a joint analysis with Fermi gamma ray data. Blazars are powered by accretion onto rotating super-massive black holes which create relativistic jets along the spin axis, though the detailed mechanism of this process still remains elusive. The jets in Blazars are aligned at a small angle to the line of sight, with the result that relativistic beaming dramatically boosts the apparent luminosity and variability. One avenue for progressing our understanding of jet production is provided by the Fermi Gamma-ray Space Telescope, which continuously monitors all gamma-ray bright Blazars, allowing an unprecedented opportunity for the systematic study of Blazar jets. The exact location of the gamma-ray emission region and its proximity to the central black hole remain subjects of debate, with two main competing classes of models for the GeV emission region. Testing these models requires a multiwavelength approach, combining the Fermi observations with supporting radio observations from OVRO-40m to search for correlations in the light curves at different frequencies.

该项目的核心是利用欧文斯谷射电天文台（OVRO，美国加州）的40米望远镜对1 500颗Blazar进行射电监测，然后利用费米伽马射线数据进行联合分析。耀变体的动力来自于旋转的超大质量黑洞的吸积，这些黑洞沿着旋转轴沿着产生相对论性喷流，尽管这个过程的详细机制仍然难以捉摸。Blazars中的喷流与视线成一个小角度，结果是相对论性光束显著地提高了表观光度和可变性。费米伽马射线太空望远镜提供了一个途径来增进我们对喷流产生的理解，它连续监测所有伽马射线明亮的Blazar，为系统研究Blazar喷流提供了前所未有的机会。伽马射线发射区的确切位置及其与中心黑洞的接近程度仍然是争论的主题，对于GeV发射区有两种主要的竞争模型。测试这些模型需要一个多波长的方法，结合费米观测与支持无线电观测从OVRO-40米搜索在不同频率的光变曲线的相关性。

项目成果

The Relativistic Jet Orientation and Host Galaxy of the Peculiar Blazar PKS 1413+135

奇特耀变体 PKS 1413 135 的相对论喷流方向和主星系

• DOI: 10.3847/1538-4357/abd08c
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Readhead A