IHEP OpenIR  > 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
2020
Source PublicationJournal of High Energy Astrophysics
ISSN2214-4048
EISSN2214-4056
Volume25Pages:1-9
SubtypeJournal Article
AbstractWe 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.
KeywordX-rays Binaries - stars Individual Sco X-1
DOI10.1016/j.jheap.2019.11.001
WOS KeywordQUASI-PERIODIC OSCILLATIONS ; NORMAL-BRANCH OSCILLATION ; SPECTRAL BEHAVIOR ; SCORPIUS X-1 ; ATOLL SOURCE ; PHASE-LAG ; VARIABILITY ; MODEL ; DEPENDENCE ; FREQUENCY
Indexed BySCI
Correlation强相关
Research Direction科学结果
Member Type核心团队
Language英语
WOS IDWOS:000519994400001
PublisherELSEVIER
ADS Bibcode2020JHEAp..25....1J
ADS URLhttps://ui.adsabs.harvard.edu/abs/2020JHEAp..25....1J
AXRIV CODE1910.08382
inspireid1759642
ItemNoIHEP00030096
Citation statistics
Cited Times:1 [INSPIRE]
Cited Times:3 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/287523
Collection硬X射线调制望远镜卫星
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
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.
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