Long-term optical and radio variability of BL Lacertae

被引：6

作者：

Guo, Y. C. ^{[1
]}

Hu, S. M. ^{[1
]}

Xu, C. ^{[1
]}

Liu, C. Y. ^{[1
]}

Chen, X. ^{[1
]}

Guo, D. F. ^{[1
]}

Meng, F. Y. ^{[1
]}

Xu, M. T. ^{[1
]}

Xu, J. Q. ^{[1
]}

机构：

[1] Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China

来源：

NEW ASTRONOMY | 2015年 / 36卷

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Galaxies: active; BL Lacertae objects: individual: BL Lacertae; Galaxies: jets; MICROVARIABILITY OBSERVATIONS; TIME SCALES; BLAZARS; OBJECTS; PERIODICITY; PHOTOMETRY; OUTBURST; REDSHIFT; BEHAVIOR; BAND;

D O I：

10.1016/j.newast.2014.09.011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Well-sampled optical and radio light curves of BL Lacertae in B, V, R, I bands and 4.8, 8.0, 14.5 GHz from 1968 to 2014 were presented in this paper. A possible 1.26 +/- 0.05 yr period in optical bands and a 7.50 +/- 0.15 yr period in radio bands were detected based on discrete correlation function, structure function as well as Jurkevich method. Correlations among different bands were also analyzed and no reliable time delay was found between optical bands. Very weak correlations were detected between V band and radio bands. However, in radio bands the variation at low frequency lagged that at high frequency obviously. The spectrum of BL Lacertae turned mildly bluer when the object turned brighter, and stronger bluer-when-brighter trends were found for short flares. A scenario including a precessing helical jet and periodic shocks was put forward to interpret the variation characteristics of BL Lacertae. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：9 / 18

页数：10

共 52 条

[1] SPECTRA AND LINEAR POLARIZATIONS OF EXTRAGALACTIC VARIABLE SOURCES AT CENTIMETER WAVELENGTHS [J].