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

被引：93

作者：

Jia, S. M. ^{[1
,2
]}

Bu, Q. C. ^{[1
,3
]}

Qu, J. L. ^{[1
,2
]}

Lu, F. J. ^{[1
]}

Zhang, S. N. ^{[1
,2
]}

Huang, Y. ^{[1
,2
]}

Ma, X. ^{[1
]}

Tao, L. ^{[1
]}

Xiao, G. C. ^{[1
,2
]}

Zhang, W. ^{[1
,2
]}

Chen, L. ^{[4
]}

Song, L. M. ^{[1
,2
]}

Zhang, S. ^{[1
]}

Li, T. P. ^{[1
,2
,5
]}

Xu, Y. P. ^{[1
,2
]}

Cao, X. L. ^{[1
]}

Chen, Y. ^{[1
]}

Liu, C. Z. ^{[1
]}

Cai, C. ^{[1
,2
]}

Chang, Z. ^{[1
]}

Chen, G. ^{[1
]}

Chen, T. X. ^{[1
]}

Chen, Y. B. ^{[6
]}

Chen, Y. P. ^{[1
]}

Cui, W. ^{[5
]}

Cui, W. W. ^{[1
]}

Deng, J. K. ^{[6
]}

Dong, Y. W. ^{[1
]}

Du, Y. Y. ^{[1
]}

Fu, M. X. ^{[6
]}

Gao, G. H. ^{[1
,2
]}

Gao, H. ^{[1
,2
]}

Gao, M. ^{[1
]}

Ge, M. Y. ^{[1
]}

Gu, Y. D. ^{[1
]}

Guan, J. ^{[1
]}

Guo, C. C. ^{[1
,2
]}

Han, D. W. ^{[1
]}

Huo, J. ^{[1
]}

Jiang, L. H. ^{[1
]}

Jiang, W. C. ^{[1
]}

Jin, J. ^{[1
]}

Jin, Y. J. ^{[7
]}

Kong, L. D. ^{[1
,2
]}

Li, B. ^{[1
]}

Li, C. K. ^{[1
]}

Li, G. ^{[1
]}

Li, M. S. ^{[1
]}

Li, W. ^{[1
]}

Li, X. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Eberhard Karls Univ Tubingen, Kepler Ctr Astro & Particle Phys, Inst Astron & Astrophys, D-72076 Tubingen, Germany

[4] Beijing Normal Univ, Dept Astron, Beijing 100088, Peoples R China

[5] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

[6] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

[7] Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China

[8] Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China

来源：

JOURNAL OF HIGH ENERGY ASTROPHYSICS | 2020年 / 25卷

基金：

中国国家自然科学基金;

关键词：

X-rays; Binaries; -; stars; Individual; Sco X-1; QUASI-PERIODIC OSCILLATIONS; NORMAL-BRANCH OSCILLATION; SPECTRAL BEHAVIOR; SCORPIUS X-1; ATOLL SOURCE; PHASE-LAG; VARIABILITY; MODEL; DEPENDENCE; FREQUENCY;

D O I：

10.1016/j.jheap.2019.11.001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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.

引用

页码：1 / 9

页数：9

共 41 条

[1] X-ray time variability across the atoll source states of 4U 1636-53 [J].