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	An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242 期刊论文 OAI收割 Astronomy and Astrophysics, 2020, 卷号: 641, 页码: A101 作者: HXMT \| 收藏 \| 浏览/下载：65/0 \| 提交时间：2022/02/08 accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract: Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions. Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst. Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.
	Timing analysis of Swift J1658.2-4242's outburst in 2018 with Insight-HXMT, NICER and AstroSat 期刊论文 OAI收割 Journal of High Energy Astrophysics, 2019, 卷号: 24, 页码: 30-40 作者: HXMT \| 收藏 \| 浏览/下载：61/0 \| 提交时间：2022/02/08 Accretion accretion disks Black hole physics X-rays: binaries: Swift J1658.2-4242 Astrophysics - High Energy Astrophysical Phenomena Abstract: We present the observational results from a detailed timing analysis of the black hole candidate Swift J1658.2-4242 during its 2018 outburst with the observations of Hard X-ray Modulation Telescope (Insight-HXMT), Neutron Star Interior Composition Explorer (NICER) and AstroSat in 0.1-250 keV. The evolution of intensity, hardness and integrated fractional root mean square (rms) observed by Insight-HXMT and NICER are presented in this paper. Type-C quasi-periodic oscillations (QPOs) observed by NICER (0.8-3.5 Hz) and Insight-HXMT (1-1.6 Hz) are also reported in this work. The features of the QPOs are analyzed with an energy range of 0.5-50 keV. The relations between QPO frequency and other characteristics such as intensity, hardness and QPO rms are carefully studied. The timing and spectral properties indicate that Swift J1658.2-4242 is a black hole binary system. Besides, the rms spectra of the source calculated from the simultaneous observation of Insight-HXMT, NICER and AstroSat support the Lense-Thirring origin of the QPOs. The relation between QPO phase lag and the centroid frequency of Swift J1658.2-4242 reveals a near zero constant when < 4Hz and a soft phase lag at 6.68 Hz. This independence follows the same trend as the high inclination galactic black hole binaries such as MAXI J1659-152.
	Multiscale Nonlinear Thermo-Mechanical Coupling Analysis of Composite Structures with Quasi-Periodic Properties 期刊论文 OAI收割 CMC-COMPUTERS MATERIALS & CONTINUA, 2017, 卷号: 53, 期号: 3, 页码: 219-248 作者: Yang, Zihao; Ma, Liang; Mai, Qiang; Cui, Junzhi; Nie, Yufeng \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2018/07/30 Thermo-mechanical coupling problem quasi-periodic properties multiscale asymptotic analysis multiscale finite element-difference algorithm
	Trace and antitrace maps for aperiodic sequences: Extensions and applications 期刊论文 OAI收割 PHYSICAL REVIEW B, 2000, 卷号: 62, 期号: 21, 页码: 14020 Wang, XG; Grimm, U; Schreiber, M 收藏 \| 浏览/下载：32/0 \| 提交时间：2013/09/23 GENERALIZED FIBONACCI LATTICES QUASI-PERIODIC MULTILAYERS ONE-DIMENSIONAL QUASICRYSTALS CRITICAL WAVE-FUNCTIONS KRONIG-PENNEY MODEL THUE-MORSE LATTICE TIGHT-BINDING ELECTRONIC-PROPERTIES SPECTRAL PROPERTIES SUBSTITUTION SEQUENCES
	EFFECT OF AN EXTERNAL MAGNETIC-FIELD ON THE PLASMON POLARITONS OF THUE-MORSE SEMICONDUCTOR SUPERLATTICES 期刊论文 OAI收割 Communications in Theoretical Physics, 1995, 卷号: 23, 期号: 1, 页码: 31-36 N. H. Liu; W. G. Feng; X. Wu 收藏 \| 浏览/下载：17/0 \| 提交时间：2012/04/14 quasi-periodic superlattices p-i superlattices nonreciprocal propagation optical-properties surface modes bulk localization excitations spectrum
	AN EXACT RENORMALIZATION-GROUP APPROACH FOR LOCAL PHONON PROPERTIES OF SINGLE-ATOM AND DOUBLE-ATOM GENERALIZED FIBONACCI SYSTEMS 期刊论文 OAI收割 Zeitschrift Fur Physik B-Condensed Matter, 1993, 卷号: 91, 期号: 4, 页码: 467-474 X. H. Yan; Yan, Jr.; J. X. Zhong; J. Q. You; Y. P. Mei 收藏 \| 浏览/下载：15/0 \| 提交时间：2012/04/14 one-dimensional quasicrystals quasi-periodic systems thue-morse lattices electronic-properties green-functions cantor spectra energy-spectra chains maps localization
	RENORMALIZATION-GROUP OF GENERALIZED FIBONACCI LATTICES 期刊论文 OAI收割 Physical Review B, 1992, 卷号: 46, 期号: 10, 页码: 6071-6079 X. H. Yan; J. X. Zhong; J. R. Yan; J. Q. You 收藏 \| 浏览/下载：25/0 \| 提交时间：2012/04/14 one-dimensional quasicrystals quasi-periodic systems electronic-properties green-functions phonon properties energy-spectra wave-functions dynamic maps localization tilings
	QUANTUM HEISENBERG-ISING MODELS ON GENERALIZED FIBONACCI LATTICES 期刊论文 OAI收割 Physical Review B, 1991, 卷号: 44, 期号: 2, 页码: 713-720 J. Q. You; X. B. Zeng; T. S. Xie; J. R. Yan 收藏 \| 浏览/下载：20/0 \| 提交时间：2012/04/14 one-dimensional quasicrystals quasi-periodic lattices electronic-properties quasiperiodic lattices magnetic excitations layered structures phonon properties spectra localization systems
	GENERALIZED FIBONACCI LATTICES - DYNAMIC MAPS, ENERGY-SPECTRA AND WAVE-FUNCTIONS 期刊论文 OAI收割 Journal of Physics-Condensed Matter, 1991, 卷号: 3, 期号: 38, 页码: 7255-7268 J. Q. You; J. R. Yan; T. S. Xie; X. B. Zeng; J. X. Zhong 收藏 \| 浏览/下载：24/0 \| 提交时间：2012/04/14 one-dimensional quasicrystals quantum ising-models quasi-periodic lattices electronic-properties quasiperiodic lattices phonon properties wave-functions trace maps localization attractors