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研究生： 范志玲
Fan, Jhih-Ling
論文名稱： 調查伽瑪射線新星發射的可見光與伽瑪射線的時間關係
Survey the Time Correlation between the Optical Light and Gamma-Ray Emission of Gamma-Ray Novae
指導教授： 李君樂
Li, Kwan-Lok
學位類別： 碩士
Master
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2025
畢業學年度： 113
語文別： 英文
論文頁數： 53
中文關鍵詞： 伽瑪射線 、新星
外文關鍵詞： Gamma-rays, novae
相關次數： 點閱：5  下載：0 
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    • 2010 年，NASA 的費米伽馬射線太空望遠鏡（Fermi Gamma-Ray Space Telescope）首次在 V407 Cyg 中檢測到新星的伽馬射線輻射。自此之後，已有 19 顆新星被確認存在伽馬射線對應體。其中，V906 Car 是這 19 顆新星之一，V906 Car的多波段觀測顯示了光學和伽馬射線的光變曲線有高度相關，並有約 5 小時的時間延遲（伽馬射線領先）。然而，其他伽馬射線新星是否也具有類似特徵尚未確定。本研究旨在透過比較費米的伽馬射線觀測數據與 AAVSO 或 BRITE 的光學數據，來探討其他伽馬射線新星是否也呈現相似的關聯性。我們採用了兩種新方法，卡方檢定（chi-squared method）和似然估計法（likelihood method）進行時間關聯分析。由於光學數據品質不穩定，目前大多數結果尚未顯示伽馬射線與光學輻射之間存在顯著的時間領先或延遲。不過我們的新分析方法與前人分析的 V906 Car時間延遲一致，表示這兩個新方法的可靠性。

    In 2010, gamma-ray emission of a nova was detected from V407 Cyg for the first time using NASA's Fermi Gamma-Ray Space Telescope. Since then, gamma-ray counterparts of 19 novae have been detected. V906 Car is one of these 19 novae, and the multi-wavelength investigations of this target showed that the optical and gamma-ray light curves are tightly correlated with a time lag of 5 hours (led by the gamma-rays). However, it is unclear whether similar features can be observed in other gamma-ray novae. This study aims to investigate whether other gamma-ray novae also exhibit similar correlations by comparing the Fermi gamma-ray observations with the optical data of AAVSO and/or BRITE, using two new methods, namely the chi-squared and the likelihood methods. With the unstable quality of optical data, most of the results, so far, do not present significant time lead/lag between the gamma-rays and the optical light. Nevertheless, our new analysis confirms the time lag of V906 Car reported previously, indicating the reliability of the new approaches.

    中文摘要 I Abstract II Acknowledgements III Contents IV List of Tables VI List of Figures VII 1 Introduction 1 1.1 Background 1 1.1.1 White Dwarf Formation 1 1.1.2 Close Binary Star Systems 2 1.1.3 Novae 3 1.1.4 Novae Emit 𝛾-rays 4 1.1.5 𝛾-ray Emission Mechanisms 5 1.2 Motivation 7 1.3 Overview of Methodology 7 1.3.1 Observations 8 1.4 Conclusion 9 2 Data Reduction 10 2.1 Fermi-LAT Observations 10 2.1.1 Selection Criteria for 𝛾-Ray Novae 10 2.1.2 Binned Likelihood Analysis 13 2.2 Optical Data 16 2.2.1 Magnitude and Flux Conversion 16 3 Method 17 3.1 Method I: Minimum Chi-Squared Method 17 3.1.1 Data Processing 17 3.1.2 Chi-Squared Minimization and Time Lag Estimation 18 3.2 Method 2: Maximum Likelihood Estimation 20 3.2.1 Maximum Likelihood Analysis 20 3.2.2 LAT Light Curve Extraction 21 3.2.3 Data preparation 21 3.2.4 Maximum Likelihood by Grid Search 22 3.2.5 Maximum Likelihood by Generic Likelihood Model 22 4 Results 23 4.1 Light Curves 23 4.2 The Results of the Time Correlation Analysis 25 4.2.1 Minimum Chi-Square 26 4.2.2 Maximum Likelihood Estimation by Grid Search 28 4.2.3 Maximum Likelihood Estimation by Generic Likelihood Model 30 4.3 Theory of Internal Radiate Shocks in Classical Novae 33 4.4 Future Work 35 Bibliography 36

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