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名稱Title
2021天文年會
國立嘉義大學蘭潭校區
5月21日至23日

論文摘要

Energy-dependent pulse behaviors for the accreting millisecond X-ray pulsar IGR 17062-6143

[ Poster ]

Chun-Chi Wang(Graduate Institute of Astronomy, National Central University, Taiwan), Yi Chou(Graduate Institute of Astronomy, National Central University, Taiwan), Hung-En Hsieh(Graduate Institute of Astronomy, National Central University, Taiwan), Jia-Fang Lin(Graduate Institute of Astronomy, National Central University, Taiwan), Tzu-His Sung(Graduate Institute of Astronomy, National Central University, Taiwan), Wei-Chih Lin(Department of Physics, National Central University, Taoyuan City, Taiwan)

We present our works on the energy-dependent pulse behaviors for the accreting millisecond X-ray pulsar (AMXP) IGR 17062-6143 using the data collected by Neutron Star Interior Composition Explorer (NICER) observations from August to November 2017. The events with energy from 0.3 to 12 keV were first divided into four energy bands and the corresponding pulse profiles were obtained by folding the events with the optimal spin and orbital parameters of the binary system. The soft lag phenomenon that often seen in other AMXPs is detected in IGR 17062-6143 with ~1098 μs from 0.3 keV to 12 keV. The rms pulse fraction amplitude increases from 0.3 to 1.15 keV and then decreases in the higher bands. We further process spectral analysis and found that the spectrum is mainly contributed by a soft blackbody emission and a hard Comptonized component. Both of energy-dependent pulse behaviors and the spectral fitting results agree with the two-component model proposed by Gierliński et al. (2002) and Poutanen & Gierliński (2003).