FRAME DRAGGING, DISK WARPING, JET PRECESSING, AND DIPPED X-RAY LIGHT CURVE OF Sw J1644+57
Lei, Wei-Hua1,2,3; Zhang, Bing2,4; Gao, He2; Lei, WH (reprint author), Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2013-01-10
卷号762期号:2
DOI10.1088/0004-637X/762/2/98
收录类别SCI
关键词Black Hole Physics Accretion Magnetic Fields Accretion Disks
摘要The X-ray transient source Sw J1644+57 recently discovered by Swift is believed to be triggered by tidal disruption of a star by a rapidly spinning supermassive black hole (SMBH). For such events, the outer disk is very likely misaligned with respect to the equatorial plane of the spinning SMBH, since the incoming star before disruption most likely has an inclined orbital plane. The tilted disk is subject to the Lense-Thirring torque, which tends to twist and warp due to the Bardeen-Petterson effect. The inner disk tends to align with the SMBH spin, while the outer region tends to remain in the stellar orbital plane, with a transition zone around the Bardeen-Petterson radius. The relativistic jet launched from the spinning SMBH would undergo precession. The 5-30 day X-ray light curve of Sw J1644+57 shows a quasi-periodic (2.7 day) variation with noticeable narrow dips. We numerically solve a warped disk and propose a jet-precessing model by invoking a Blandford-Znajek jet collimated by a wind launched near the Bardeen-Petterson radius. Through simulations, we show that the narrow dips in the X-ray light curve can be reproduced for a range of geometric configurations. From the data we infer that the inclination angle of the initial stellar orbit is in the range of 10 degrees-20 degrees from the SMBH equatorial plane, that the jet should have a moderately high Lorentz factor, and that the inclination angle, jet opening angle, and observer's viewing angle are such that the duty cycle of the line of sight sweeping the jet cone is somewhat less than 0.5.
项目资助者NSF(AST-0908362) ; NASA(NNX10AD48G) ; National Natural Science Foundation of China(11003004,11173011,U1231101) ; National Basic Research Program ("973" Program) of China(2009CB824800) ; China Scholarship Program ; Key Laboratory for the Structure and Evolution of Celestial Objects of Chinese Academy of Sciences ; Cheung Kong scholarship
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000313008900032
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MASSIVE BLACK-HOLE ; TIDAL DISRUPTION ; NUMERICAL-SIMULATION ; ACCRETION DISCS ; BURSTS ; EVOLUTION ; DYNAMICS ; MODEL ; STAR ; J164449.3+573451
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被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9419
专题中国科学院天体结构与演化重点实验室
通讯作者Lei, WH (reprint author), Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China.
作者单位1.School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2.Department of Physics and Astronomy, University of Nevada Las Vegas, 4505 Maryland Parkway, Box 454002, Las Vegas, NV 89154-4002, USA
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
4.Kavli Institute for Astronomy and Astrophysics and Department of Astronomy, Peking University, Beijing 100871, China
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Lei, Wei-Hua,Zhang, Bing,Gao, He,et al. FRAME DRAGGING, DISK WARPING, JET PRECESSING, AND DIPPED X-RAY LIGHT CURVE OF Sw J1644+57[J]. ASTROPHYSICAL JOURNAL,2013,762(2).
APA Lei, Wei-Hua,Zhang, Bing,Gao, He,&Lei, WH .(2013).FRAME DRAGGING, DISK WARPING, JET PRECESSING, AND DIPPED X-RAY LIGHT CURVE OF Sw J1644+57.ASTROPHYSICAL JOURNAL,762(2).
MLA Lei, Wei-Hua,et al."FRAME DRAGGING, DISK WARPING, JET PRECESSING, AND DIPPED X-RAY LIGHT CURVE OF Sw J1644+57".ASTROPHYSICAL JOURNAL 762.2(2013).
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