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Probing Physical Conditions in Blazars (Active Galaxies) through Time-Dependent Optical Light

通过随时间变化的光学光探测耀变体（活跃星系）的物理条件

基本信息

批准号：
1615796
负责人：
Alan Marscher
金额：
$ 49.4万
依托单位：
Trustees of Boston University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-08-15 至 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615796&HistoricalAwards=false
关键词：
Probing Physical Conditions Blazars Active

项目摘要

Blazars are the ultra-luminous, highly-variable hearts of galaxies. Physicians have tools to study how the human heart varies, and that variability is used to understand how the heart works. Similarly, astronomers have tools to study how blazars vary, and that variability is used to understand how blazars work. The team will use telescopes in Arizona to observe blazars at optical wavelengths. They will look for minute-to-minute changes in the blazars' brightness and polarization. They will also look for night-to-night changes in the blazars' emission lines. These changes will be compared to predictions from the team's models. Senior team members will train junior members. Navajo-Hopi students from Arizona schools will visit the telescopes. While there, they will be able to witness the changes in the blazars.The team will investigate the physical processes responsible for blazars' time variability. The team's goals are to use observations and models to examine (1) if particles are accelerated via shocks or magnetic reconnection; (2) if very rapid variability on parsec scales is caused by turbulence or magnetic reconnection; and (3) if gamma-rays can be generated on parsec scales via the seed photons from nearby emission-line gas.

耀变体是超亮的、高度可变的星系中心。医生有工具来研究人类心脏是如何变化的，这种变化被用来理解心脏是如何工作的。同样，天文学家也有工具来研究耀变体的变化，这种变化被用来理解耀变体是如何工作的。该小组将使用亚利桑那州的望远镜在光学波长上观察耀变体。他们将观察耀变体的亮度和偏振每分钟的变化。他们还将寻找耀变体发射线的夜间变化。这些变化将与团队模型的预测结果进行比较。高级团队成员将培训初级成员。来自亚利桑那州学校的纳瓦霍-霍皮族学生将参观望远镜。在那里，他们将能够目睹耀变体的变化。该小组将调查造成耀变体时间变化的物理过程。该团队的目标是通过观察和模型来检验(1)粒子是否通过冲击或磁重联加速；(2)如果湍流或磁重联引起了秒差距尺度上的快速变化；(3)伽马射线能否通过附近发射线气体的种子光子在秒差距尺度上产生。