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 (1) , B. Boulderstone , D. Brooks , D. L. Burke , A. Carnero Rosell , D. Carollo , M. Carrasco Kind , J. Carretero , M. Costanzi , L. N. da Costa , T. 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

1 IAP - Institut d'Astrophysique de Paris

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.

Keywords: galaxies: active; quasars: individual: PKS 0027-426; galaxies: jets; Astrophysics - Astrophysics of Galaxies; Astrophysics - High Energy Astrophysical Phenomena

Domains: Sciences of the Universe [physics]

E. Guise, S. F. Hönig, T. Almeyda, K. Horne, M. Kishimoto, et al.. Multiwavelength optical and NIR variability analysis of the Blazar PKS 0027-426. Monthly Notices of the Royal Astronomical Society, 2022, 510, pp.3145-3177. ⟨10.1093/mnras/stab3457⟩. ⟨insu-03748288⟩