Multiwavelength Temporal Variability of the Blazar PKS 1510–089

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Astrophysical Journal, Volume 953, issue 1
We perform correlation and periodicity search analyses on long-term multiband light curves of the flat-spectrum radio quasar PKS 1510−089 observed by the space-based Fermi-Large Area Telescope in γ-rays, the SMARTS and Steward Observatory telescopes in optical and near-infrared (NIR), and the 13.7 m radio telescope in Metsähovi Radio Observatory between 2008 and 2018. The z-transform discrete correlation function method is applied to study the correlation and possible time lags among these multiband light curves. Among all pairs of wavelengths, the γ-ray versus optical/NIR and optical versus NIR correlations show zero time lags; however, both the γ-ray and optical/NIR emissions precede the radio radiation. The generalized Lomb–Scargle periodogram, weighted wavelet z-transform, and REDFIT techniques are employed to investigate the unresolved core emission–dominated 37 GHz light curve and yield evidence for a quasi period around 1540 days, although given the length of the whole data set it cannot be claimed to be significant. We also investigate the optical/NIR color variability and find that this source shows a simple redder-when-brighter behavior over time, even in the low-flux state.
Funding Information: This publication makes use of data obtained at Metsähovi Radio Observatory, operated by Aalto University in Finland. The various diligent observers of Aalto University in Finland are thankfully acknowledged. This paper has made use of up-to-date SMARTS optical/near-infrared light curves that are available at . SMARTS observations of Large Area Telescope-monitored blazars are supported by Yale University and Fermi GI grant NNX 12AP15G, and the SMARTS 1.3 m observing queue received support from NSF grant AST-0707627. Data from the Steward Observatory spectropolarimetric monitoring project were used. This program is supported by Fermi GI grants NNX08AW56G, NNX09AU10G, NNX12AO93G, and NNX15AU81G. This work has made use of publicly available Fermi-LAT data obtained from FSSC's website data server and provided by NASA Goddard Space Flight Center. This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister etal. ). Acknowledgments Funding Information: This work is supported by the National Key R&D Intergovernmental Cooperation Program of China (2023YFE0102300, 2022YFE0133700), the Regional Collaborative Innovation Project of Xinjiang Uyghur Autonomous Region (2022E01013), the National Natural Science Foundation of China (12173078, 11773062), and the Chinese Academy of Sciences (CAS) “Light of West China” Program (2017-XBQNXZ-A-008, 2021-XBQNXZ-005). P.K. acknowledges support from the Department of Science and Technology (DST), government of India, through the DST-INSPIRE Faculty grant (DST/INSPIRE/04/2020/002586). A.C.G. is partially supported by the Chinese Academy of Sciences (CAS) President’s International Fellowship Initiative (PIFI; grant No. 2016VMB073). The work of A.T. was supported by the Innovation Program of the Shanghai Municipal Education Commission, grant No. 2019-01-07-00-07-E00035, and the National Natural Science Foundation of China (NSFC), grant No. 11973019. M.F.G. acknowledges support from the National Natural Science Foundation of China (grant No. 11873073), Shanghai Pilot Program for Basic Research Chinese Academy of Science, Shanghai Branch (JCYJ-SHFY2021-013), and the science research grants from the China Manned Space Project (No. CMSCSST-2021-A06). Publisher Copyright: © 2023. The Author(s). Published by the American Astronomical Society.
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Yuan , Q , Kushwaha , P , Gupta , A C , Tripathi , A , Wiita , P J , Zhang , M , Liu , X , Lähteenmäki , A , Tornikoski , M , Tammi , J , Ramakrishnan , V , Cui , L , Wang , X , Gu , M F , Bambi , C & Volvach , A E 2023 , ' Multiwavelength Temporal Variability of the Blazar PKS 1510–089 ' , Astrophysical Journal , vol. 953 , no. 1 , 47 .