The characteristic periodicity analysis of the radio flux variability of quasar PKS 1510-089

Abstract

A wavelet analysis method is introduced to study the possible periods of PKS 1510-089 in radio bands. By compiling the radio light curve of PKS 1510-089 at frequencies of 22 and 37 GHz from 1990 to 2005, and using the wavelet analysis method, the evidence of quasi-periodic activity in PKS 1510-089 was obtained. The results indicate that: (1) There are two stable outburst periods of T 1 =(1.80±0.06) yr and T 2 = (0.90±0.07) yr presenting in the isoplethal map of PKS 1510-089 at the radio band 37 GHz; (2) there is an outburst period of T 1 =(1.80±0.06) yr presenting at the radio band 22 GHz; (3) by the continuum of the isograms map, we find the primary period of PKS 1510-089 is T 1 =(1.80±0.06) yr, and the period of T 2 = (0.90±0.07) yr may be the half period. The above results are consistent with the reports of Xie et al.

Transient Quasi-Periodic Oscillations at $γ$-rays in the TeV Blazar PKS 1510-089

“…Based on 27-year long UMRAO data of PKS 1510-089 at 4.8, 8 and 14.5 GHz, Fan et al (2007) claimed a possible ∼12-year periodicity. The 15-year long 22 and 37 GHz radio data from 1990 to 2005 revealed two periodicities of 0.9 years and 1.8 years, which agrees well with the deep flux minima periodicity of 1.84 years and thereby, strengthens the binary black hole assumption (Xie et al 2008;Zhang et al 2009;Fu et al 2014). According to Castignani et al (2017), QPO analysis of hard X-ray data of PKS 1510-089 taken by RXTE-PCA from 1996 to 2011 reveals no obvious periodicity.…”

Optical spectral behaviour of the blazar PKS 0537--441

“…但是, 也有研究者指出耀变体的光学谱特性是复杂 的, 可能不是单一的 BWB 或 RWB 性质 [20,27] . [29] , Mrk 421 射电 22 GHz 波 段的约 3.85 a [30] , PKS 1510-089 射电和 X 射线波段 的约 1.80 a [31,32]…”

The γ-Ray and Optical Variability Analysis of the BL Lac Object 3FGL J0449.4−4350

“…The variabilities are important features of Fermi blazars. The observed multi-wavelength variabilities of many sources show some kind of periodicity (Valtaoja et al 1985;Sillanpaa et al 1996;Li et al 2006;Xie et al 2008;Zhang et al 2009Zhang et al , 2017aZhang et al , 2017bZhang et al , 2017cSandrinelli et al 2016aSandrinelli et al , 2016b, e.g., PKS 2155-403 (Sandrinelli et al 2014(Sandrinelli et al , 2016aZhang et al 2017a), PG 1553+113 (Ackermann et al 2015a;Sobacchi et al 2017;Yan et al 2018;Zhou et al 2018). However, many of these claims are marginal, Most of them cannot be verified by new observations.…”

“…The variabilities are important features of Fermi blazars. The observed multi-wavelength variabilities of many sources show some kind of periodicity (Valtaoja et al 1985;Sillanpaa et al 1996;Li et al 2006;Xie et al 2008;Zhang et al 2009;Sandrinelli et al 2016A, B;Zhang et al 2017A, B, C), e.g. PKS 2155-403 (Zhang et al 2017A;Sandrinelli et al 2014, PG 1553+113 (Ackermann et al 2015A;Sobacchi et al 2017;Yan et al 2018;Zhou et al 2018).…”