伽瑪射線探測望遠鏡於低地軌道背景之波霎觀測評估

Pulsar detection of GRX in Low Earth Orbit

曾昭雄(Chao-Hsiung Tseng)

指導教授 ： 張祥光

國立清華大學/理學院/天文研究所/碩士(2015年)

摘要

在本文中，我們嘗試估計脈衝星探測伽馬射線資源管理器（GRX）.GRX是一種軟伽瑪射線望遠鏡，預計於2020年執行衛星任務，有3次成功升空氣球在過去的十年。GRX具有良好的空間和能量分辨率，可以做的很好康普頓事件的重建，幫助我們探索軟伽瑪射線天體物理目標. 對於數據分析，GRX使用最大期望最大化（MLEM）算法來提高成像性能。我們的結論是GRX具有12.7個標準差在（L，B）=（0135）為5分鐘的曝光和大於10個標準差在（L，B）=（0,180），對於百萬電子伏特範圍蟹星雲<1分鐘。我們還對Vela脈衝星具有7.9個標準差在（L，B）=（0,180）在1天的觀察，和對於0.005蟹狀星雲通量在（L, B）=（0,180）位置有8.7個標準差，在2天的觀察。該結果比GRX的原型於2009年氣球飛行更好的在6個標準差6小時暴露。

關鍵字

波霎

並列摘要

In this thesis, we try to estimate the pulsar detection of Gamma Ray Explorer (GRX). GRX is a soft gamma-ray telescope, which is expected on satellite mission in 2020, with 3 times successful balloon launch in past decade. GRX has good spatial and energy resolution, which can do well Compton event reconstruction, to help us explore soft gamma-ray astrophysics objects. For data analysis, GRX use Maximum Likelihood Expectation Maximization (MLEM) algorithm to improve imaging property. We conclude that GRX has 12.7 sigma detection at (l,b)=(0,135) with a 5 minute exposure and > 10 sigma detection at (l,b)=(0,180) with 1 < minute for Crab nebula in MeV range. We also present Vela pulsar has 7.9 sigma detection at (l,b)=(0,180) in 1-day observation, and 8.7 sigma detection for 0.005 Crab flux at (l,b)=(0,180) in a 2-day observation. The results are much better than prototype balloon flight of GRX in 2009 with 6 sigma detection in 6 hours exposure time.

並列關鍵字

Pulsar

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