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Fractal dimension and thermodynamic fluctuation properties of IDV light curves
Leung, Chun-Sing1,2; Wei, Jian-Yan1; Kovacs, Zoltan3,4; Harko, Tiberiu3,4
2011-09-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号11期号:9页码:1031-1045
摘要Fractals are a basic tool for phenomenologically describing natural objects having a high degree of temporal or spatial variability. From a physical point of view the fractal properties of natural systems can also be interpreted by using the standard formalism of thermodynamical fluctuations. We introduce and analyze the fractal dimension of the Intra-Day-Variability (IDV) light-curves of BL Lac objects, in the optical, radio and X-ray bands. A general description of the fluctuation spectrum of these systems based on general thermodynamical principles is also proposed. Based on the general fractal properties of a given physical system, we also introduce the predictability index for the IDV light curves. We have explicitly determined the fractal dimension for the R-band observations of five blazars, as well as for the radio band observations of the compact extragalactic radio source J 1128+5925 and of several X-ray sources. Our results show that the fractal dimension of the optical and X-ray observations indicates an almost pure "Brownian noise" (random walk) spectrum, with a very low predictability index, while in the radio band the predictability index is much higher. We have also studied the spectral properties of the IDV light curves and we have shown that their spectral index is very closely correlated with the corresponding fractal dimension.
关键词Galaxies Quasars: Emission Lines Instabilities Gravitation
收录类别SCI
语种英语
WOS记录号WOS:000295116100003
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7911
专题空间科学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
4.Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China
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Leung, Chun-Sing,Wei, Jian-Yan,Kovacs, Zoltan,et al. Fractal dimension and thermodynamic fluctuation properties of IDV light curves[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(9):1031-1045.
APA Leung, Chun-Sing,Wei, Jian-Yan,Kovacs, Zoltan,&Harko, Tiberiu.(2011).Fractal dimension and thermodynamic fluctuation properties of IDV light curves.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(9),1031-1045.
MLA Leung, Chun-Sing,et al."Fractal dimension and thermodynamic fluctuation properties of IDV light curves".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.9(2011):1031-1045.
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