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arXiv 0710.3030astro-ph
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黑洞双星GRS 1915+105的瞬态低频QPO

A transient low-frequency QPO from the black hole binary GRS 1915+105

Paolo Soleri, Tomaso Belloni, Piergiorgio Casella

摘要:

本文给出了1996年9月至1997年12月期间对候选黑洞GRS 1915+105的五次Rossi X射线定时探测器观测的定时分析结果。目的是研究可能存在的B型准周期振荡(QPO)。由于在其他系统中,这种QPO被发现出现在从硬态到软态的光谱转变期间,因此我们分析了具有快速且强变化性特征的观测结果,以便进行大量转变。在GRS 1915+105中,跃迁发生在非常短的时间尺度(~秒)上:为了将它们挑出来,我们在3D硬度-硬度-强度图上沿着源覆盖的规则路径对功率密度谱进行了平均。我们发现了C型和B型准周期振荡(QPO):这是GRS 1915+105中首次检测到B型QPO。由于光谱跃迁与相对论性射电喷流的发射和准直有关,它们在原型星系喷流源中的存在加强了这种联系。

英文摘要:

We present the results of the timing analysis of five Rossi X-ray Timing Explorer observations of the Black Hole Candidate GRS 1915+105 between 1996 September and 1997 December. The aim was to investigate the possible presence of a type-B quasi-periodic oscillation (QPO). Since in other systems this QPO is found to appear during spectral transitions from Hard to Soft states, we analyzed observations characterized by a fast and strong variability, in order to have a large number of transitions. In GRS 1915+105, transitions occur on very short time scales (~ sec): to single them out we averaged Power Density Spectra following the regular path covered by the source on a 3D Hardness-Hardness-Intensity Diagram. We identified both the type-C and the type-B quasi-periodic oscillations (QPOs): this is the first detection of a type-B QPO in GRS 1915+105. As the spectral transitions have been associated to the emission and collimation of relativistic radio-jets, their presence in the prototypical galactic jet source strengthens this connection.

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