Multiwavelength optical and NIR variability analysis of the Blazar PKS 0027-426. Issue 3 (1st December 2021)

• Record Type: Journal Article
• Authors: Guise, E; Hönig, S F; Almeyda, T; Horne, K; Kishimoto, M; Aguena, M; Allam, S; Andrade-Oliveira, F; Asorey, J; Banerji, M; Bertin, E; Boulderstone, B; Brooks, D; Burke, D L; Carnero Rosell, A; Carollo, D; Carrasco Kind, M; Carretero, J; Costanzi, M; da Costa, L N; Davis, T M; De Vicente, J; Doel, P; Everett, S; Ferrero, I; Flaugher, B; Frieman, J; Gandhi, P; Goad, M; Gruen, D; Gruendl, R A; Gschwend, J; Gutierrez, G; Hinton, S R; Hollowood, D L; Honscheid, K; James, D J; Johnson, M A C; Kuehn, K; Lewis, G F; Lidman, C; Lima, M; Maia, M A G; Malik, U; Menanteau, F; Miquel, R; Morgan, R; Ogando, R L C; Palmese, A; Paz-Chinchón, F; Pereira, M E S; Pieres, A; Plazas Malagón, A A; Sanchez, E; Scarpine, V; Serrano, S; Sevilla-Noarbe, I; Seymour, N; Smith, M; Soares-Santos, M; Suchyta, E; Swanson, M E C; Tarle, G; To, C; Tucker, B E;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 510:Issue 3(2022)
• Page Start: 3145
• Page End: 3177
• Publication Date: 2021-12-01
• Subjects: galaxies: active -- quasars: individual: PKS 0027-426 -- galaxies: jets; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab3457
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: 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.