Insight-HXMT study of the timing properties of Sco X-1

doi:10.1016/j.jheap.2019.11.001

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 硬X射线调制望远镜卫星

	Insight-HXMT study of the timing properties of Sco X-1
	The Insight-HXMT Collaboration
刊名	Journal of High Energy Astrophysics
	2020
卷号	25 页码:1-9
关键词	X-rays Binaries - stars Individual Sco X-1
ISSN号	2214-4048
DOI	10.1016/j.jheap.2019.11.001
英文摘要	We present a detailed timing study of the brightest persistent X-ray source Sco X-1 using the data collected by the Hard X-ray Modulation Telescope (Insight-HXMT) from July 2017 to August 2018. Acomplete Z-track hardness-intensity diagram (HID) is obtained. The normal branch oscillations (NBOs) at similar to 6 Hz in the lower part of the normal branch (NB) and the flare branch oscillations (FBOs) at similar to 16 Hz in the beginning part of the flaring branch (FB) are found in observations with the Low Energy Xray Telescope (LE) and the Medium Energy X-ray Telescope (ME) of Insight-HXMT, while the horizontal branch oscillations (HBOs) at similar to 40 Hz and the kilohertz quasi-periodic oscillations (kHz QPOs) at similar to 800 Hz are found simultaneously above 20 keV for the first time on the horizontal branch (HB) by the High Energy X-ray Telescope (HE) and ME. We find that for all types of the observed QPOs, the centroid frequencies are independent of energy, while the root mean square (rms) increases with energy; the centroid frequencies of both the HBOs and kHz QPOs increase along the Z-track from the top to the bottom of the HB; and the NBOs show soft phase lags increasing with energy. A continuous QPO transition from the FB to NB in similar to 200 s are also detected. Our results indicate that the non-thermal emission is the origin of all types of QPOs, the innermost region of the accretion disk is non-thermal in nature, and the corona is nonhomogeneous geometrically. (C) 2019 Elsevier B.V. All rights reserved.
电子版国际标准刊号	2214-4056
WOS关键词	QUASI-PERIODIC OSCILLATIONS ; NORMAL-BRANCH OSCILLATION ; SPECTRAL BEHAVIOR ; SCORPIUS X-1 ; ATOLL SOURCE ; PHASE-LAG ; VARIABILITY ; MODEL ; DEPENDENCE ; FREQUENCY
出版者	ELSEVIER
WOS记录号	WOS:000519994400001
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/287523]
专题	硬X射线调制望远镜卫星
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	The Insight-HXMT Collaboration. Insight-HXMT study of the timing properties of Sco X-1[J]. Journal of High Energy Astrophysics,2020,25:1-9.
APA	The Insight-HXMT Collaboration.(2020).Insight-HXMT study of the timing properties of Sco X-1.Journal of High Energy Astrophysics,25,1-9.
MLA	The Insight-HXMT Collaboration."Insight-HXMT study of the timing properties of Sco X-1".Journal of High Energy Astrophysics 25(2020):1-9.