KMS of Xinjiang Astronomical Observatory, CAS
| 基于南山 26 米射电望远镜开展快速射电暴的搜寻 | |
| Alternative Title | A search for fast radio bursts based on the Nanshan 26m radio telescope |
毛建伟
| |
| Subtype | 硕士 |
| Thesis Advisor | 袁建平 |
| 2022-05-25 | |
| Degree Grantor | 中国科学院大学 |
| Place of Conferral | 北京 |
| Degree Name | 理学硕士 |
| Degree Discipline | 天体物理 |
| Keyword | 快速射电暴，搜寻，数据分析 |
| Abstract | 快速射电暴（fast radio burst，FRB）是持续时间短、亮度高的射电爆发，其爆发的物理机制尚不完全清楚。本文主要介绍了作者在硕士期间开展的快速射电暴搜寻的相关工作，包括管道的搭建、测试和实际开展的搜寻项目。作者基于南山 26 米射电望远镜，搭建了一个离线的快速射电暴搜寻管道。为了获得管道的性能，在观测数据中注入了 5000 个模拟的快速射电暴，并使用搭建的管道进行了搜寻测试。模拟快速射电暴的注入搜寻测试结果表明，管道可以恢复几乎所有（≳90%）信噪比（signal-to-noise ratio，SNR）大于 15 的注入的模拟脉冲信号， 对于注入信噪比在 10 到 15 之间的模拟快速射电暴，其恢复率仍然是可以接受的（≳80%），恢复率与信噪比、脉冲宽度和色散（dispersion measure，DM）显示出关联性。进一步的，作者开展了一些搜寻快速射电暴的项目。在 2021 年 6 月 2 日至 7 月 20 日期间，南山 26 米射电望远镜对 FRB 20201124A 进行了观测和搜寻，总共收集了 104.5 小时的高时间分辨率数据。在这段时间没有探测到 FRB 20201124A 的爆发，没有探测到爆发的可能原因是观测时间处于该源的一个非活跃窗口，或者是在这段时间内爆发强度低于南山 26 米射电望远镜的灵敏度下 限。南山 26 米射电望远镜在 2022 年 2、3 月在FRB 20201124A 的活跃期对其进行了观测，并成功探测到了明亮的单脉冲，验证了设备和搜寻管道的可靠性。此 外，南山 26 米射电望远镜还对磁星 XTE J1810−197 进行了观测，搜寻并分析了该颗磁星亮单脉冲的性质，给出了亮单脉冲的宽度和峰值流量密度的分布，还研究了亮单脉冲轮廓的准周期性质。除了对已知的目标源进行观测搜寻，南山 26 米射电望远镜还尝试对银道 30 平方度的天区进行了观测和搜寻，并未搜寻到有明显天文特征的天体信号。 |
| Other Abstract | Fast radio bursts (FRBs) are short duration, high brightness radio bursts, with their physical mechanism not being fully understood. This thesis mainly introduces the related work of fast radio bursts search carried out by the author during his master’s degree, including the construction and testing of the pipeline and the observation and search projects. The author built an off-line fast radio burst search pipeline based on the Nanshan 26m radio telescope. To obtain the efficiency of the pipeline, 5000 simulated fast radio bursts were injected into the observational data and performed search tests using the pipeline. The results of the injected search test for simulated fast radio bursts show that the pipeline can recover almost all (≳90%) with signal-to-noise ratios (SNR) greater than 15, and the recovery rate remains acceptable for simulated fast radio bursts with injected SNRs between 10 and 15 (≳80%), with the recovery rate showing relations with SNR, pulse width and dispersion measure(DM). Furthermore, the author has carried out some projects to search for fast radio bursts. Between 2 June and 20 July 2021, the Nanshan 26m radio telescope observed FRB 20201124A, a total of 104.5 hours of high time resolution data were collected. No bursts of FRB 20201124A were detected during this time, and the possible reasons for the lack of detection are that the observation time was in an inactive window for the source, or that the intensity of the burst was below the lower sensitivity limit of the Nanshan 26 m radio telescope during this period. The Nanshan 26m radio telescope observed the active period of FRB 20201124A in February and March 2022, and successfully detected the bright single pulses, which verified the reliability of the equipment and search pipeline. Nanshan 26 m radio telescope also observed the magnetar XTE J1810−197. Analysis of the nature of the bright single pulses of the magnetar, gave the distribution of the widths and peak flux density and the quasi periodic nature of the bright single pulses. In addition to observing and searching for known target sources, the Nanshan 26m radio telescope has also searched the 30 square degree sky area of the galactic plane, but no significant celestial emission were detected. |
| Pages | 60 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/5163 |
| Collection | 研究生学位论文 射电天文研究室_脉冲星研究团组 |
| Affiliation | 中国科学院新疆天文台 |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | 毛建伟. 基于南山 26 米射电望远镜开展快速射电暴的搜寻[D]. 北京. 中国科学院大学,2022. |
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| 基于南山 26 米射电望远镜开展快速射电（13618KB） | 学位论文 | 暂不开放 | CC BY-NC-SA | Application Full Text | ||
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