摘要
In the radiation-hydrodynamics model,the time lag and fractional root-mean-squared(rms) amplitude as a function of emitted photon energy should show a minimum on the normal branch oscillations.This has been seen in the Z-sources Cyg X-2 and GX 5-1.Here,using the observations from the Rossi X-ray Timing Explorer(RXTE),we study the energy dependence of normal branch QPOs in the peculiar Z-source Cir X-1.We discuss the results in the context of radiation-hydrodynamics and the Comptonization model.
In the radiation-hydrodynamics model,the time lag and fractional root-mean-squared(rms) amplitude as a function of emitted photon energy should show a minimum on the normal branch oscillations.This has been seen in the Z-sources Cyg X-2 and GX 5-1.Here,using the observations from the Rossi X-ray Timing Explorer(RXTE),we study the energy dependence of normal branch QPOs in the peculiar Z-source Cir X-1.We discuss the results in the context of radiation-hydrodynamics and the Comptonization model.
作者
QU JinLu1,LU Yu1,2,DING GuoQiang3,ZHANG Fan1,LEI YaJuan1 & LI ZhiBing1 1 Key Laboratory for Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China
2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China
3 Urumqi Observatory,NAOC Urumqi 830011,China
基金
supported by the National Basic Research Program of China (Grant No. 2009CB824800)
the National Natural Science Foundation of China (Grant No. 10773017)
the Natural Science Foundation of Xinjiang Uygur Autonomous Region of China (Grant No. 200821164)
the Program of the Light in Chinese Western Region (LCWR) (Grant No. LHXZ 200802)
