报告题目：STEMS3D: An X-ray Spectral Model for Magnetar Persistent Radiations

　　报告人：翁山杉（南京师范大学）

　　报告人简介：翁山杉，现就职于南京师范大学。于2005、2010年分别获得厦门大学学士、博士学位。2010-2012年在中科院高能物理研究所做博士后研究。2012-2015年，先后工作于湘潭大学、土耳其Sabanci大学。2015年11月入职于南京师范大学。

　　摘要：Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) are recognized as the most promising magnetar candidates, as indicated by their energetic bursts and rapid spin-downs. It is expected that the strong magnetic field leaves distinctive imprints on the emergent radiation both by affecting the radiative processes in atmospheres of magnetars and by scattering in the upper magnetospheres. We construct a self-consistent physical model that incorporates emission from the magnetar surface and its reprocessing in the three-dimensional (3D) twisted magnetosphere using a Monte Carlo technique. The synthetic spectra are characterized by four parameters: surface temperature kT, surface magnetic field strength $B$, magnetospheric twist angle $\Delta\phi$, and the normalized electron velocity $\beta$. We also create a tabular model (STEMS3D) and apply it to spectra of magnetars.

　　时间：5月4日（周三）下午4点

　　地点：天文楼402会议室

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　　                                             南京大学天文与空间科学学院