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

E Guise*, S F Hönig, T Almeyda, K Horne, M Kishimoto, M Aguena, S Allam, F Andrade-Oliveira, J Asorey, M Banerji, E Bertin, B Boulderstone, D Brooks, D L Burke, A Carnero Rosell, D Carollo, M Carrasco Kind, J Carretero, M Costanzi, L N da CostaT M Davis, J De Vicente, P Doel, S Everett, I Ferrero, B Flaugher, J Frieman, P Gandhi, M Goad, D Gruen, R A Gruendl, J Gschwend, G Gutierrez, S R Hinton, D L Hollowood, K Honscheid, D J James, M A C Johnson, K Kuehn, G F Lewis, C Lidman, M Lima, M A G Maia, U Malik, F Menanteau, R Miquel, R Morgan, R L C Ogando, A Palmese, F Paz-Chinchón, M E S Pereira, A Pieres, A A Plazas Malagón, E Sanchez, V Scarpine, S Serrano, I Sevilla-Noarbe, N Seymour, M Smith, M Soares-Santos, E Suchyta, M E C Swanson, G Tarle, C To, B E Tucker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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We present multiwavelength spectral and temporal variability analysis of PKS 0027-426 using optical griz observations from Dark Energy Survey between 2013 and 2018 and VEILS Optical Light curves of Extragalactic TransienT Events (VOILETTE) between 2018 and 2019 and near-infrared (NIR) JKs observations from Visible and Infrared Survey Telescope for Astronomy Extragalactic Infrared Legacy Survey (VEILS) between 2017 and 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 time-scales 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, stable when brighter, and redder when brighter trends over different time-scales and using different combinations of optical filters. Additional analysis of the optical spectra is performed to provide further understanding of this complex spectral behaviour.
Original languageEnglish
Pages (from-to)3145-3177
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date1 Dec 2021
Publication statusPublished - Mar 2022


  • Galaxies: active
  • Quasars: individual: PKS 0027-426
  • Galaxies: jets


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