A study of the pointed observation methods and sensitivity of HXMT

• Published in: Chinese physics C Vol. 34; no. 1; pp. 66 - 71
• Main Author: 金晶 陈勇 张双南 张澍 李新乔 李刚
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2010; Department of Engineering Physics, Tsinghua University, Beijing 100084, China; Center for Astrophysics, Tsinghua University, Beijing 100084, China%Key Laboratory of Particle Astrophysics, Institute of High Energy Physics,Chinese Academy of Sciences, Beijing 100049, China%Department of Physics, Tsinghua University, Beijing 100084, China; Center for Astrophysics, Tsinghua University, Beijing 100084, China; Key Laboratory of Particle Astrophysics, Institute of High Energy
• Subjects: X射线仪器; X射线天文卫星; 低能量; 敏感性分析; 灵敏度; 硬X射线调制望远镜; sensitivity; off-axis; pointed observation; HXMT
• ISSN: 1674-1137; 0254-3052; 2058-6132
• DOI: 10.1088/1674-1137/34/1/012

The Hard X-ray Modulation Telescope （HXMT） is an X-ray astronomy satellite consisting of three slat-collimated instruments, the High Energy X-ray Instrument （HE）, the Medium Energy X-ray Instrument （ME）, and the Low Energy X-ray Instrument （LE）. HXMT will carry out an all sky survey and make pointed observations in the 1-250 keV energy band. In order to get the source and background fluxes simultaneously in the pointed observations, two methods, i.e., the combined field of view （FOV） method and the off-axis pointing method are proposed in this paper. Comprehensive analyses of the sensitivities of the three instruments by using these two methods are presented, respectively. It is found that the off-axis pointing method has a higher sensitivity for HE and ME but a lower sensitivity for LE. Since the axes of the three instruments are aligned along the same direction, the off-axis pointing method is recommended as the main method in the pointed observation for HXMT; the combined FOV method can be used when LE is the most relevant instrument in order to satisfy the scientific objective of the observation.