Timing analysis of the black hole candidate Swift J1727.8-1613: Detection of a dip-like feature in the high-energy cross spectrum
文献类型：期刊论文
| 作者 | Jin, Pei7; Méndez, Mariano7; García, Federico6; Altamirano, Diego1; Zhang GB(张国宝)4,5 ; Rout, Sandeep K.3
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2025-06-25 |
| 卷号 | 699 |
| 关键词 | accretion accretion disks stars: black holes stars: individual: Swift J1727.8-1613 X-rays: binaries |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202554353 |
| 产权排序 | 第4完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present a timing analysis of observations with the Hard X-ray Modulation Telescope of the black hole X-ray transient Swift J1727.8-1613 during its 2023 outburst. We detect, for the first time in a black hole X-ray binary, a prominent dip at similar to 3 - 15 Hz in the real part of the cross spectrum between high-energy (> 25 keV) and low-energy (< 10 keV) photons in the low hard and hard intermediate states, during which the QPO frequency rapidly increases and then stabilizes at similar to 1.0 - 1.5 Hz. Remarkably, the real part of the cross spectrum reaches negative values at the frequencies around the minimum of the dip, which is indicative of a phase lag ranging between pi/2 and pi in this frequency range. We fit the power spectra and the real and imaginary parts of the cross spectra simultaneously using a multi-Lorentzian model. Among the lag models, the Gaussian phase-lag model provides a slightly better reduced chi 2 than the constant phase-lag and constant time-lag models, while it also alleviates the degeneracy associated with those models. From the parameters of the Lorentzian that fits the dip, we estimated the size of the accretion flow, which consistently exceeds 10 000 km as the QPO frequency increases from 0.13 Hz to 2.0 Hz. Furthermore, both the energy-dependent phase-lag and fractional-rms spectra of the dip exhibit a change in trend around 15 keV, with the phase lag dropping and the rms reaching a local minimum. These spectra closely resemble the shapes predicted by the time-dependent Comptonization model, vKompth, for a low feedback factor, offering a pathway to explain the radiative properties of the corona. Additionally, the coherence function suggests a diversity of variability components potentially arising from different parts of the corona. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
| WOS关键词 | QUASI-PERIODIC OSCILLATIONS ; X-RAY VARIABILITY ; COMPTONIZATION MODEL ; NEUTRON-STAR ; GRS 1915+105 ; COHERENCE ; MODULATION ; EVOLUTION ; EMISSION ; NOISE |
| 资助项目 | Dutch Research Council (NWO)[184.034.002]; China Scholarship Council[CSC 202304910058]; CONICET[PIBAA1275]; ERDF A way of making Europe; COSPAR fellowship program; Spanish MCIN/AEI[PID2022-136828NB-C42] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001515445000012 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | Dutch Research Council (NWO)[184.034.002] ; China Scholarship Council[CSC 202304910058] ; CONICET[PIBAA1275] ; ERDF A way of making Europe ; COSPAR fellowship program ; Spanish MCIN/AEI[PID2022-136828NB-C42] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28408]  |
| 专题 | 星系类星体研究组 |
| 通讯作者 | Jin, Pei; Méndez, Mariano |
| 作者单位 | 1.Villa Elisa, Buenos Aires, Argentina; 2.Center for Astrophysics and Space Science, New York University Abu Dhabi, PO Box 129188 Abu Dhabi, UAE 3.University of Chinese Academy of Sciences, Beijing 100049, PR China; 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, PR China; 5.School of Physics and Astronomy, University of Southampton, Southampton, Hampshire SO17 1BJ, UK; 6.Instituto Argentino de Radioastronomía (CCT La Plata, CONICET; CICPBA; UNLP), C.C.5, 7.Kapteyn Astronomical Institute, University of Groningen, P.O. BOX 800 9700 AV Groningen, The Netherlands; |
| 推荐引用方式 GB/T 7714 | Jin, Pei,Méndez, Mariano,García, Federico,et al. Timing analysis of the black hole candidate Swift J1727.8-1613: Detection of a dip-like feature in the high-energy cross spectrum[J]. ASTRONOMY & ASTROPHYSICS,2025,699. |
| APA | Jin, Pei,Méndez, Mariano,García, Federico,Altamirano, Diego,张国宝,&Rout, Sandeep K..(2025).Timing analysis of the black hole candidate Swift J1727.8-1613: Detection of a dip-like feature in the high-energy cross spectrum.ASTRONOMY & ASTROPHYSICS,699. |
| MLA | Jin, Pei,et al."Timing analysis of the black hole candidate Swift J1727.8-1613: Detection of a dip-like feature in the high-energy cross spectrum".ASTRONOMY & ASTROPHYSICS 699(2025). |
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来源：云南天文台
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