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

Research output: Contribution to journalArticlepeer-review


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 (US)
Pages (from-to)3145-3177
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Mar 1 2022


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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