Multi-wavelength Optical and NIR Variability Analysis of the Blazar PKS 0027-426
Abstract
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 (VISTAExtragalactic 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.
Keywords
Cite
@article{arxiv.2108.13386,
title = {Multi-wavelength Optical and NIR Variability Analysis of the Blazar PKS 0027-426},
author = {E. Guise and S. F. Hönig and T. Almeyda and K. Horne and M. Kishimoto and M. Aguena and S. Allam and F. Andrade-Oliveira and J. Asorey and M. Banerji and E. Bertin and B. Boulderstone and D. Brooks and D. L. Burke and A. Carnero Rosell and D. Carollo and M. Carrasco Kind and J. Carretero and M. Costanzi and L. N. da Costa and T. M. Davis and J. De Vicente and P. Doel and S. Everett and I. Ferrero and B. Flaugher and J. Frieman and P. Gandhi and M. Goad and D. Gruen and R. A. Gruendl and J. Gschwend and G. Gutierrez and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and M. A. C. Johnson and K. Kuehn and G. F. Lewis and C. Lidman and M. Lima and M. A. G. Maia and U. Malik and F. Menanteau and R. Miquel and R. Morgan and R. L. C. Ogando and A. Palmese and F. Paz-Chinchón and M. E. S. Pereira and A. Pieres and A. A. Plazas Malagón and E. Sanchez and V. Scarpine and S. Serrano and I. Sevilla-Noarbe and N. Seymour and M. Smith and M. Soares-Santos and E. Suchyta and M. E. C. Swanson and G. Tarle and C. To and B. E. Tucker},
journal= {arXiv preprint arXiv:2108.13386},
year = {2021}
}
Comments
Accepted for publication in MNRAS. 33 pages, 28 figures, 11 tables