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Optical variability of quasars with 20-yr photometric light curves

Stone, Zachary ; Shen, Yue ; Burke, Colin J ; Chen, Yu-Ching ; Yang, Qian ; Liu, Xin ; Gruendl, R A ; Adamów, M ; Andrade-Oliveira, F ; Annis, J ; Bacon, D ; Bertin, E ; Bocquet, S ; Brooks, D ; Burke, D L ; Carnero Rosell, A ; Carrasco Kind, M ; Carretero, J ; da Costa, L N ; Pereira, M E S ; De Vicente, J ; Desai, S ; Diehl, H T ; Doel, P ; Ferrero, I ; Friedel, D N ; Frieman, J ; García-Bellido, J ; Gaztanaga, E ; Gruen, D ; Gutierrez, G ; Hinton, S R ; Hollowood, D L ; Honscheid, K ; James, D J ; Kuehn, K ; Kuropatkin, N ; Lidman, C ; Maia, M A G ; Menanteau, F ; Miquel, R ; Morgan, R ; Paz-Chinchón, F ; Pieres, A ; Plazas Malagón, A A ; Rodriguez-Monroy, M ; Sanchez, E ; Scarpine, V ; Serrano, S ; Sevilla-Noarbe, I ; Smith, M ; Suchyta, E ; Swanson, M E C ; Tarlé, G ; To, C

Monthly notices of the Royal Astronomical Society, 2022-06, Vol.514 (1), p.164-184 [Periódico revisado por pares]

United Kingdom: Oxford University Press

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Título:
Optical variability of quasars with 20-yr photometric light curves
Autor: Stone, Zachary ; Shen, Yue ; Burke, Colin J ; Chen, Yu-Ching ; Yang, Qian ; Liu, Xin ; Gruendl, R A ; Adamów, M ; Andrade-Oliveira, F ; Annis, J ; Bacon, D ; Bertin, E ; Bocquet, S ; Brooks, D ; Burke, D L ; Carnero Rosell, A ; Carrasco Kind, M ; Carretero, J ; da Costa, L N ; Pereira, M E S ; De Vicente, J ; Desai, S ; Diehl, H T ; Doel, P ; Ferrero, I ; Friedel, D N ; Frieman, J ; García-Bellido, J ; Gaztanaga, E ; Gruen, D ; Gutierrez, G ; Hinton, S R ; Hollowood, D L ; Honscheid, K ; James, D J ; Kuehn, K ; Kuropatkin, N ; Lidman, C ; Maia, M A G ; Menanteau, F ; Miquel, R ; Morgan, R ; Paz-Chinchón, F ; Pieres, A ; Plazas Malagón, A A ; Rodriguez-Monroy, M ; Sanchez, E ; Scarpine, V ; Serrano, S ; Sevilla-Noarbe, I ; Smith, M ; Suchyta, E ; Swanson, M E C ; Tarlé, G ; To, C
Assuntos: ASTRONOMY AND ASTROPHYSICS ; quasars ; Sciences of the Universe ; supermassive black holes ; surveys
É parte de: Monthly notices of the Royal Astronomical Society, 2022-06, Vol.514 (1), p.164-184
Notas: NFR/287772
FERMILAB-PUB-21-606-PPD; arXiv:2201.02762
AC02-07CH11359
USDOE Office of Science (SC), High Energy Physics (HEP)
Descrição: ABSTRACT We study the optical gri photometric variability of a sample of 190 quasars within the SDSS Stripe 82 region that have long-term photometric coverage during ∼1998−2020 with SDSS, PanSTARRS-1, the Dark Energy Survey, and dedicated follow-up monitoring with Blanco 4m/DECam. With on average ∼200 nightly epochs per quasar per filter band, we improve the parameter constraints from a Damped Random Walk (DRW) model fit to the light curves over previous studies with 10–15 yr baselines and ≲ 100 epochs. We find that the average damping time-scale τDRW continues to rise with increased baseline, reaching a median value of ∼750 d (g band) in the rest frame of these quasars using the 20-yr light curves. Some quasars may have gradual, long-term trends in their light curves, suggesting that either the DRW fit requires very long baselines to converge, or that the underlying variability is more complex than a single DRW process for these quasars. Using a subset of quasars with better-constrained τDRW (less than 20 per cent of the baseline), we confirm a weak wavelength dependence of τDRW∝λ0.51 ± 0.20. We further quantify optical variability of these quasars over days to decades time-scales using structure function (SF) and power spectrum density (PSD) analyses. The SF and PSD measurements qualitatively confirm the measured (hundreds of days) damping time-scales from the DRW fits. However, the ensemble PSD is steeper than that of a DRW on time-scales less than ∼ a month for these luminous quasars, and this second break point correlates with the longer DRW damping time-scale.
Editor: United Kingdom: Oxford University Press
Idioma: Inglês;Norueguês

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Optical variability of quasars with 20-yr photometric light curves

United Kingdom: Oxford University Press

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