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arXiv 1003.0317astro-ph.HE
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GRS 1915+105的朱雀观测:极限环振荡期间吸积盘结构的演化

Suzaku Observation of GRS 1915+105: Evolution of Accretion Disc Structure during Limit-Cycle Oscillation

Y. Ueda, K. Honda, H. Takahashi, C. Done, H. Shirai, Y. Fukazawa, K. Yamaoka, S. Naik, H. Awaki, K. Ebisawa, J. Rodriguez, S. Chaty

摘要:

我们目前的结果从朱雀观测的微类星体GRS 1915+105在2005年10月多波长活动。数据包括稳定状态(χ类)和极限环振荡(θ类)。在光谱分析中充分考虑了正确的星际吸收以及尘埃散射的影响。在2-120 keV带,两个态的能谱都是由光学厚(τ~7-10)、低温(T_e ~2-3 keV)的混合等离子体对盘光子的强康普顿化所支配的,该混合等离子体含有总输入功率的10-60%的非热电子。在振荡过程中检测到的高电离铁离子的吸收线表明,一个强大的盘风的发展。风的电离阶段与X射线通量相关,支持光电离起源。铁-K发射线在振荡过程中表现出很强的变化性;反射在倾斜过程中最强,但在耀斑过程中消失。我们将其解释为“自屏蔽”的证据,即康普顿化日冕在耀斑阶段变得几何厚,阻止光子照射外盘。低温高光度的盘发射表明,盘的结构类似于正则黑洞双星的甚高态。在振荡过程中的光谱变化的磁盘的几何形状和康普顿化日冕的物理参数的变化,特别是分数功率提供给非热粒子的加速解释。

英文摘要:

We present results from the Suzaku observation of the microquasar GRS 1915+105 performed during the 2005 October multiwavelength campaign. The data include both stable state (class χ) and limit-cycle oscillation (class θ). Correct interstellar absorption as well as effects of dust scattering are fully taken into account in the spectral analysis. The energy spectra in the 2-120 keV band in both states are all dominated by strong Comptonization of disk photons by an optically thick (τ~7-10) and low temperature (T_e ~2-3 keV) hybrid plasmas containing non-thermal electrons produced with 10-60% of the total power input. Absorption lines of highly ionized Fe ions detected during the oscillation indicate that a strong disk wind is developed. The ionization stage of the wind correlates with the X-ray flux, supporting the photoionization origin. The iron-K emission line shows a strong variability during the oscillation; the reflection is strongest during the dip but disappears during the flare. We interpret this as evidence for "self-shielding" that the Comptonizing corona becomes geometrically thick in the flare phase, preventing photons from irradiating the outer disk. The low-temperature and high luminosity disk emission suggests that the disk structure is similar to that in the very high state of canonical black hole binaries. The spectral variability during the oscillation is explained by the change of the disk geometry and of the physical parameters of Comptonizing corona, particularly the fractional power supplied to the acceleration of non-thermal particles.

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