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arXiv 1101.1979astro-ph.HEastro-ph.IM
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GRS 1915+105中准稳态振荡与宽带噪声分量的耦合

Coupling between QPOs and broadband noise components in GRS 1915+105

Thomas J. Maccarone, Philip Uttley, Michiel van der Klis, Rudy Wijnands, Paolo S. Coppi

摘要:

我们探讨使用的双谱理解准周期振荡。双谱是一种统计量,它探测不同频率下傅立叶谱的相对相位之间的关系。双谱的使用使我们能够打破不同模型之间的退化时间序列产生相同的功率谱。我们看看GRS 1915+105的几个观测数据时,源显示出强烈的准周期振荡和强宽带噪声分量在其功率谱。我们表明,尽管在功率谱强的相似性,双谱可以有很大的不同。在所有情况下,存在这样的频率范围,其中双相干(非线性的度量)对于涉及准周期振荡的频率的频率是强的,这表明准周期振荡耦合到噪声分量,而不是独立地产生。我们将数据中的双异质性与简单模型进行了比较,发现了一些定性的相似之处。

英文摘要:

We explore the use of the bispectrum for understanding quasiperiodic oscillations. The bispectrum is a statistic which probes the relations between the relative phases of the Fourier spectrum at different frequencies. The use of the bispectrum allows us to break the degeneracies between different models for time series which produce identical power spectra. We look at data from several observations of GRS 1915+105 when the source shows strong quasi-periodic oscillations and strong broadband noise components in its power spectrum. We show that, despite strong similarities in the power spectrum, the bispectra can differ strongly. In all cases, there are frequency ranges where the bicoherence, a measure of nonlinearity, is strong for frequencies involving the frequency of the quasi-periodic oscillations, indicating that the quasi-periodic oscillations are coupled to the noise components, rather than being generated independently. We compare the bicoherences from the data to simple models, finding some qualitative similarities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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