Long-term X-ray variability of ultraluminous X-ray sources

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101301

Title:	Long-term X-ray variability of ultraluminous X-ray sources
Authors:	周翊;Lin, Lupin Chun-Che;Hu, Chin-Ping;Kong, Albert K. H.;Yen, David Chien-Chang;Takata, Jumpei;Chou, Yi
Contributors:	理學院天文研究所
Keywords:	Accretion disks;Binary stars;Dynamic tests;Galaxies;Milky Way;Modulation;Orbitals;Star & galaxy formation;X-ray astronomy;X-ray sources;X-rays
Date:	2015-01-01
Issue Date:	2026-04-21 14:29:49 (UTC+8)
Publisher:	Oxford University Press;London: Oxford University Press
Abstract:	摘要： Long-term X-ray modulations on time-scales from tens to hundreds of days have been widely studied for X-ray binaries located in the Milky Way and the Magellanic Clouds. For other nearby galaxies, only the most luminous X-ray sources can be monitored with dedicated observations. We here present the first systematic study of long-term X-ray variability of four ultraluminous X-ray sources (ESO 243-49 HLX-1, Holmberg IX X-1, M81 X-6, and NGC 5408 X-1) monitored with Swift. By using various dynamic techniques to analyse their light curves, we find several interesting low-frequency quasi-periodicities. Although the periodic signals may not represent any stable orbital modulations, these detections reveal that such long-term regular patterns may be related to superorbital periods and structure of the accretion discs. In particular, we show that the outburst recurrence time of ESO 243-49 HLX-1 varies over time and suggest that it may not be the orbital period. Instead, it may be due to some kinds of precession, and the true binary period is expected to be much shorter. 出版者： London: Oxford University Press 出版日期： 2015-12-01 出處： Monthly notices of the Royal Astronomical Society, 2015-12, Vol.454 (2), p.1644-1657 資源來源： Alma/SFX Local Collection 版權： 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2015 版權： Copyright Oxford University Press, UK Dec 1, 2015 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-8711 識別號： ISSN: 1365-2966 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stv2025
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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