Multiband optical–IR variability of the blazar PKS 0537–441

Li, Xiaopan; Wang, Lisha; Yang, Cheng; Yang, Haiyan; Zhou, Li; Xu, Guoqing; Shan, Yu-Qiong; Liu, Jie; Luo, Yuhui; Zhang, Li

doi:10.1007/s12036-018-9522-9

Cited by 1 publication

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Longer lags have also been found between the optical and NIR light curves in other blazars, for example, Safna et al ( 2020 ) found significant time delays for three FSRQs on the order of 10-100 d. Similarly, Li et al ( 2018 ) found that the NIR light curves variations lagged the optical by a few weeks in PKS 0537-441. Additional non-zero lags were also measured for PKS 0027-426 inconsistently across the light curves, for example, in the 2017 season, when optical light curves were included in the cross-correlation, an observed lag of ∼± 75 d (which corresponds to a rest frame lag of ∼± 50 d) was often recorded.…”

Section: Temporal Variabilitymentioning

confidence: 85%

“…Ho we v er, some studies hav e also reported lags on the order of 10-100 d between optical and NIR light curves in blazars (e.g. Li et al 2018 ;Safna et al 2020 ), which could imply that the sources of the emission are located with a distance between them, or Li et al ( 2018 ) suggest that if the emission is produced by shocks in the jet, the higher energy emission could emerge closer to the front of the shock than the lower energy emission, resulting in a delay.…”

Section: Introductionmentioning

confidence: 95%

“…Ho we ver, temporal v ariability analysis is used here to explore whether any larger lags, possibly one corresponding to a delay between the thermal emission in the optical and NIR, could be detected as well, as other studies have reported significant lags between the optical and NIR in blazars on the order of 10-100 d (e.g. Li et al 2018 ;Safna et al 2020 ).…”

Section: T E M P O R a L Va R I A B I L I T Ymentioning

confidence: 99%

See 2 more Smart Citations

Multiwavelength optical and NIR variability analysis of the Blazar PKS 0027-426

Guise

Hönig

Almeyda

et al. 2021

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We present multi-wavelength spectral and temporal variability analysis of PKS 0027-426 using optical griz observations from DES (Dark Energy Survey) between 2013-2018 and VOILETTE (VEILS Optical Light curves of Extragalactic TransienT Events) between 2018-2019 and near infrared (NIR) JKs observations from VEILS (VISTA Extragalactic Infrared Legacy Survey) between 2017-2019. Multiple methods of cross-correlation of each combination of light curve provides measurements of possible lags between optical-optical, optical-NIR, and NIR-NIR emission, for each observation season and for the entire observational period. Inter-band time lag measurements consistently suggest either simultaneous emission or delays between emission regions on timescales smaller than the cadences of observations. The colour-magnitude relation between each combination of filters was also studied to determine the spectral behaviour of PKS 0027-426. Our results demonstrate complex colour behaviour that changes between bluer when brighter (BWB), stable when brighter (SWB) and redder when brighter (RWB) trends over different timescales and using different combinations of optical filters. Additional analysis of the optical spectra is performed to provide further understanding of this complex spectral behaviour.

show abstract

Section: Temporal Variabilitymentioning

confidence: 85%