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Lomb-Scargle Periodogram方法研究耀变体3C 454.3长周期光变特性

Studying the Properties of Long-period Light Variation about Blazar 3C 454.3 with the Methods for Lomb-Scargle Periodogram

  • 摘要: 从SMARTS(The Small and Moderate Aperture Research Telescope System)数据库和文献中收集耀变体3C 454.3(z=0.859)从2008年6月到2017年7月光学波段B,V,R和红外波段J,K的数据,分别获得了B波段891组、V波段855组、R波段877组、J波段860组和K波段751组共4234组数据。根据这些观测数据,利用LSP(Lomb-Scargle Periodogram)方法和加权小波Z变换法(Weighted Wavelet Z-transform, WWZ)研究了各个波段的周期,结果表明:(1)3C 454.3在光学和红外波段都有454天的光变周期;(2)5个波段存在454天的长周期光变,由此得到3C 454.3中心黑洞质量为M≈0.24×106M,辐射区半径为R≈3.68×108 km;(3)通过长周期光变分析,预测耀变体3C 454.3在2021年6月左右将再次爆发。

     

    Abstract: In this paper, in order to study the feature of optical and infrared radiation of the Blazar 3C 454.3 (z=0.589), data are collected from SMARTS dataset and other literature, involving optical bands B, V, R and infrared bands J, K. The data covers the decade from June 2008 to July 2017, including 891 groups in B-band, 855 groups in V-band, 877 groups in R-band, 860 groups in J-band, and 751 groups in K-band, with 4234 points in total. Using the observed data, we employ LombScargle Periodogram (LSP) and the Weighted Wavelet Z-Transform (WWZ) method to study the possible periods in each band. The results show that:(1) There is a period of 454 days in both optical and infrared bands of 3C 454.3; (2) Using a period of 454 days, we obtain the mass of black hole of 3C 454.3 approximately to be:M≈0.24×106M and the radius of radiation region:R≈3.68×108 km. (3) Through these analyses, the blazar 3C 454.3 would burst out again around June 2021.

     

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