Spectral lags of flaring events in LS I+61°303 from RXTE Observations

作     者：Tamal Sarkar Samir Sarkar Arunava Bhadra 

作者机构：High Energy&Cosmic Ray Research CentreUniversity of North BengalSiliguriWB 734013India University Science Instrumentation CentreUniversity of North BengalSiliguriWB 734013India 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第7期

页      面：29-38页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0704[理学-天文学] 0825[工学-航空宇航科学与技术] 

主　　题：X-rays:binaries X-rays:individual(LS I+61?303) 

摘      要：This work reports the first discovery of（negative） spectral lags in X-ray emission below 10 ke V from the gamma ray binary LS I＋61？303 during large flaring episodes using Rossi X-ray Timing Explorer（RXTE） observations. It is found from the RXTE data that during the flares, low energy（3–5 ke V） variations lead the higher energy（8–10 ke V） variations by a few tens of seconds whereas no significant time lag is observed during the non-flaring states. The observed spectral lag features for flaring events suggest that inverse Compton scattering may be operating, at least in some part of the system. Another possibility is that the sites of particle acceleration may be different for flaring and non-flaring events such as in the microquasar model, in which the flaring radiation may come from hot spots sitting above the black hole while steady state emissions are due to the jets.