Energy dependence of the band-limited noise in black hole X-ray binaries
文献类型：期刊论文
| 作者 | Stiele, H.; Yu, W.
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-10-01 |
| 卷号 | 452期号:4页码:3666-3678 |
| 关键词 | black hole physics binaries: close X-rays: binaries X-rays: individual: H 1743-322 GX 339-4 XTE J1650-500 XTE J1752-223 Swift J1753.5-0127 |
| 英文摘要 | Black hole low-mass X-ray binaries show a variety of variability features, which manifest as narrow peak-like structures superposed on broad noise components in power density spectra in the hard X-ray emission. In this work, we study variability properties of the band-limited noise component during the low-hard state for a sample of black hole X-ray binaries. We investigate the characteristic frequency and amplitude of the band-limited noise component and study covariance spectra. For observations that show a noise component with a characteristic frequency above 1 Hz in the hard energy band (4-8 keV), we found this very same component at a lower frequency in the soft band (1-2 keV). This difference in characteristic frequency is an indication that while both the soft and the hard band photons contribute to the same band-limited noise component, which likely represents the modulation of the mass accretion rate, the origin of the soft photons is actually further away from the black hole than the hard photons. Thus, the soft photons are characterized by larger radii, lower frequencies and softer energies, and are probably associated with a smaller optical depth for Comptonization upscattering from the outer layer of the corona, or suggest a temperature gradient of the corona. We interpret this energy dependence within the picture of energy-dependent power density states as a hint that the contribution of the up-scattered photons originating in the outskirts of the Comptonizing corona to the overall emission in the soft band is becoming significant. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | QUASI-PERIODIC OSCILLATIONS ; CYGNUS X-1 ; HARD STATE ; DOMINATED ACCRETION ; SWIFT J1753.5-0127 ; FAST VARIABILITY ; SPECTRAL STATES ; POWER SPECTRA ; GX 339-4 ; TRANSITIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000360862100027 |
| 公开日期 | 2015-11-10 |
| 源URL | [http://119.78.226.72/handle/331011/28254]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Shanghai Astron Observ, Shanghai 200030, Shanghai, Peoples R China 2.Ctr Galaxy & Cosmol, Shanghai 200030, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Stiele, H.,Yu, W.. Energy dependence of the band-limited noise in black hole X-ray binaries[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,452(4):3666-3678. |
| APA | Stiele, H.,&Yu, W..(2015).Energy dependence of the band-limited noise in black hole X-ray binaries.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,452(4),3666-3678. |
| MLA | Stiele, H.,et al."Energy dependence of the band-limited noise in black hole X-ray binaries".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 452.4(2015):3666-3678. |
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来源：上海天文台
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