查詢結果分析
相關文獻
- Particle Acceleration in Pulsar Magnetospheres
- The Potential Flow Field Generated by the Flanged Hood Openings of Various Shapes
- 伽瑪射線爆發源(Gamma Ray Bursts)
- Lotus 1-2-3 與數值方法
- Structural Changes in the Mouse Heart One Year after Brain Exposure to 佄Co Gamma Ray
- 治療用電子射束在均勻物質中能量損失的數值方法模擬
- 中式肉品加工常用香辛料之微生物品質調查
- 二維雙船帆在黏性流場中的空氣動力性能
- 二維有限體積模式分析潰壩水流
- 一維移流傳輸方程式之數值解法比較
頁籤選單縮合
題 名 | Particle Acceleration in Pulsar Magnetospheres=脈衝星磁場球內的粒子加速 |
---|---|
作 者 | 徐佩君; 廣谷幸一; 張祥光; | 書刊名 | 臺北天文館學報 |
卷 期 | 4 民95.12 |
頁 次 | 頁17-26 |
分類號 | 323.1 |
關鍵詞 | 伽瑪射線; 數值方法; 脈衝星; Gamma-rays: theory; Methods: numerical; Pulsars: general; |
語 文 | 英文(English) |
中文摘要 | 我們討論一高轉速中子星磁場球內的粒子加速連鎖反應;全球性電流造成電荷空乏區內存在延著磁力線的強大電場,正負電子經由此電場加速幅射出伽瑪射線,某些伽瑪射線與中子星表面放出的X射線碰撞產生正負電子對,這些帶電粒子屏蔽了部分原來的電場,所有物理過程都須同時考慮。此篇論文中,我們首次討論粒子加速區隨時間演化的性質,藉由同時解Poisson方程與正負電子及光子的 non-stationary Boltzmann方程。將此方法應用至毫秒脈衝星上,考慮磁極冠表面被往回流的加速粒子撞擊加熱,我們發現對於一定範圍的毫秒脈衝星參數(自轉週期、週期微分、磁傾角),解會收斂為穩定解,此時粒子加速連鎖反應藉由磁極冠的熱輻射維持。檢驗一加速區是否能自我維持,我們訂出毫秒脈衝星在週期-週期微分圖上對於幾個不同磁傾角的死亡線。 |
英文摘要 | We investigate a pair creation cascade in the magnetosphere of a rapidly rotating neutron star. The charge depletion due to global flows of charged particles causes a large electric field along the magnetic field lines. Electrons and positrons are accelerated by this field to radiate gamma-rays via curvature process. Some of the gamma-rays collide with the X-rays emitted from the stellar surface to materialize as pairs in the gap. The replenished charges partially screen the original electric field. To take in to account of these physical processes self-consistently, we solve the set of the Poisson equation for the electro-static potential and the Boltzmann equations for electrons, positrons, and gamma-ray photons simultaneously. In this paper, we first examine the time-dependent nature of particle accelerators by solving the non-stationary Boltzmann equations on the two-dimensional poloidal plane in which both the rotational and magnetic axes reside. Evaluating the temperature of the heated polar cap surface, which is located near the magnetic pole, by the bombardment of gap-accelerated particles, and applying the scheme to millisecond pulsar parameters, we demonstrate that the solution converges to a stationary solution of which pair-creation cascade is maintained by the heated polar-cap emission, in a wide range of three-dimensional parameter space (period, period derivative, magnetic inclination angle). We also present the deathlines of millisecond pulsars. |
本系統中英文摘要資訊取自各篇刊載內容。