Tracking the evolution of quasi-periodic oscillation in RE J1034+396 using the Hilbert-Huang transform

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101221

Title:	Tracking the evolution of quasi-periodic oscillation in RE J1034+396 using the Hilbert-Huang transform
Authors:	周翊;Hu, Chin-Ping;Chou, Yi;Yang, Ting-Chang;Su, Yi-Hao
Contributors:	理學院天文研究所
Keywords:	ACCRETION DISKS;Active galactic nuclei;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;COMPARATIVE EVALUATIONS;CORRELATIONS;COUNTING RATES;DECOMPOSITION;EVOLUTION;FREQUENCY ANALYSIS;GALAXY NUCLEI;HARD X RADIATION;OSCILLATIONS;PERIODICITY;Phase lag;Quasi-Periodic Oscillations;SEYFERT GALAXIES;SPECTRA;TIMING PROPERTIES;Transforms;X-RAY GALAXIES;XMM (spacecraft)
Date:	2014-06-10
Issue Date:	2026-04-21 14:27:37 (UTC+8)
Publisher:	IOP Publishing Ltd.;United States
Abstract:	摘要： RE J1034+396, a narrow-line Seyfert 1 active galactic nucleus (AGN), is the first example of AGNs that exhibited a nearly coherent quasi-periodic oscillation (QPO) for the data collected by XMM-Newton in 2007. The spectral behaviors and timing properties of the QPO have been studied since its discovery. We present an analysis of the QPO in RE J1034+396 based on the Hilbert-Huang transform. Comparing with other time-frequency analysis methods, the Hilbert spectrum reveals the variation of the QPO period in great detail. Furthermore, the empirical mode decomposition provides bandpass-filtered data that can be used in the O - C and correlation analysis. We suggest that it is better to divide the evolution of the QPO in this observation into three epochs according to their different periodicities. In addition to the periodicities, the correlations between the QPO periods and corresponding mean count rates are also different in these three epochs. Further examining the phase lags in these epochs, we found no significant phase lags between the soft and hard X-ray bands, which is also confirmed in the QPO phase-resolved spectral analysis. Finally, we discuss the indications of current models including a spotted accretion disk, diskoseismology, and oscillation of shock according to the observed time-frequency and spectral behaviors. 出版者： United States 出版日期： 2014-06-10 出處： The Astrophysical journal, 2014-06, Vol.788 (1), p.1-11 資源來源： Institute of Physics Journals 識別號： ISSN: 0004-637X 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/788/1/31
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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