青山学院大学図書館

Multiwavelength afterglows from two-component jets in very-high-energy gamma-ray bursts

佐藤, 優理, Issued : 2024. <TF02037562>
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コレクションコード 博士論文
コレクションコード 博士学位論文
タイトル Multiwavelength afterglows from two-component jets in very-high-energy gamma-ray bursts
タイトル(その他) 超高エネルギーガンマ線放射を伴うガンマ線バーストの二成分を持つジェットからの多波長残光放射
チョウコウエネルギー ガンマセン ホウシャ オ トモナウ ガンマセン バースト ノ ニセイブン オ モツ ジェット カラ ノ タハチョウ ザンコウ ホウシャ
作成者 佐藤, 優理
サトウ, ユリ
出版者 青山学院大学
出版者 アオヤマ ガクイン ダイガク
本文リンク 本文 : 1
本文リンク 内容の要旨および審査の結果の要旨 : 2
DOI URL https://doi.org/10.34321/TF02037562
日付 Issued : 2024
内容記述 Gamma-ray bursts (GRBs) are the most luminous and violent explosive electromagnetic events in the universe. GRBs also have broadband afterglows, from radio to very-high-energy (VHE) gamma rays, which provide us with extensive physical information about their nature. Currently, it is widely believed that prompt gamma-ray photons are emitted by a relativistic jet toward us, and that the interaction of this jet with the surrounding medium of the source generates the afterglow. However, many fundamental questions remain unanswered: how is the relativistic jet formed, what is the origin of the central engine, and how is the multiwavelength afterglow radiated? In this thesis, we explore the phenomena associated with the relativistic two-component jet, which consists of two top-hat jets with angularly equi-distributed energy with different opening angles, to investigate the formation mechanism of relativistic jets. In general, the GRB jets have an angular structure, which is also shown in previous hydrodynamic simulations. Such a structured jet is most simply approximated by a two-component jet. The two-component jet model has been motivated to explain the multiwavelength afterglow emission in some GRB events. Furthermore, this model has been demonstrated in studies of tidal disruption events (TDEs) both theoretically and observationally. In our analysis, it is found that a possible link between X-ray afterglows and VHE gamma-ray emission. Our two-component jet model successfully explains the multiwavelength afterglows of GRBs associated with VHE gamma-ray emission. Moreover, the radio afterglow emission in some TDEs can also be well described by our two-component jet model. These findings suggest that a structured jet, such as the two-component jet, is essential for explaining complex multiwavelength afterglows. Both stellar solar-mass black holes and supermassive black holes can naturally lead to structured relativistic jets via a common mechanism.
資源タイプ doctoral thesis
資料種別(NIIタイプ) 学位論文
物理的形態 PDFファイル
アクセス権 open access
報告番号 甲第388号
学位記番号 博理理甲第38号
学位名 博士(理学)
学位授与年月日 2025.03.25
学位授与機関 32601 : 青山学院大学
ユーザ項目01
ユーザ項目01