Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ287 on Timescales Ranging from Decades to Hours
| dc.authorid | Jermak, Helen/0000-0002-1197-8501 | |
| dc.authorid | Simon, Andrew/0000-0003-0404-5559 | |
| dc.authorid | Hovatta, Talvikki/0000-0002-2024-8199 | |
| dc.authorid | Boumis, Panos/0000-0002-4260-940X | |
| dc.authorid | Sonbas, Eda/0000-0002-6909-192X | |
| dc.authorid | Liakos, Alexios/0000-0002-0490-1469 | |
| dc.authorid | Vasylenko, Volodymyr/0000-0001-8864-2363 | |
| dc.contributor.author | Goyal, A. | |
| dc.contributor.author | Stawarz, L. | |
| dc.contributor.author | Zola, S. | |
| dc.contributor.author | Marchenko, V. | |
| dc.contributor.author | Soida, M. | |
| dc.contributor.author | Nilsson, K. | |
| dc.contributor.author | Ciprini, S. | |
| dc.date.accessioned | 2025-01-27T20:11:51Z | |
| dc.date.available | 2025-01-27T20:11:51Z | |
| dc.date.issued | 2018 | |
| dc.department | Çanakkale Onsekiz Mart Üniversitesi | |
| dc.description.abstract | We present the results of our power spectral density analysis for the BL Lac object OJ 287, utilizing the Fermi-LAT survey at high-energy.-rays, Swift-XRT in X-rays, several ground-based telescopes and the Kepler satellite in the optical, and radio telescopes at GHz frequencies. The light curves are modeled in terms of continuous-time autoregressive moving average (CARMA) processes. Owing to the inclusion of the Kepler data, we were able to construct for the first time the optical variability power spectrum of a blazar without any gaps across similar to 6 dex in temporal frequencies. Our analysis reveals that the radio power spectra are of a colored-noise type on timescales ranging from tens of years down to months, with no evidence for breaks or other spectral features. The overall optical power spectrum is also consistent with a colored noise on the variability timescales ranging from 117 years down to hours, with no hints of any quasi-periodic oscillations. The X-ray power spectrum resembles the radio and optical power spectra on the analogous timescales ranging from tens of years down to months. Finally, the.-ray power spectrum is noticeably different from the radio, optical, and X-ray power spectra of the source: we have detected a characteristic relaxation timescale in the Fermi-LAT data, corresponding to similar to 150 days, such that on timescales longer than this, the power spectrum is consistent with uncorrelated (white) noise, while on shorter variability timescales there is correlated (colored) noise. | |
| dc.description.sponsorship | Polish National Science Centre (NCN) [2012/04/A/ST9/00083]; Polish NSC grant [UMO-2016/22/E/ST9/00061]; GA CR [13-33324S]; National Aeronautics and Space Administration (NASA) [NAS8-03060]; Polish NCN grant [OPUS 2014/13/B/ST9/00570]; National Science Foundation (NSF) grant [AST-1211916]; NASA grant [NNX12AF12G]; TABASGO Foundation; Christopher R. Redlich Fund; Miller Institute for Basic Research in Science (U.C. Berkeley); Google; University of Michigan; NSF [AST-0607523, AST-0808050, AST-1109911]; NASA Fermi grants [NNX09AU16G, NNX10AP16G, NNX11A013G]; NASA [NNX08AW31G, NNX11A043G]; NASA; Department of Energy (DOE) in the United States; Commissariat a l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France; Agenzia Spaziale Italiana; Istituto Nazionale di Fisica Nucleare in Italy; Ministry of Education, Culture, Sports, Science and Technology (MEXT); High Energy Accelerator Research Organization (KEK); Japan Aerospace Exploration Agency (JAXA) in Japan; KA Wallenberg Foundation; Swedish Research Council; Swedish National Space Board in Sweden; Istituto Nazionale di Astrofisica in Italy; Centre National d'Etudes Spatiales in France; DOE Contract [DE-AC02-765F00515]; [2013/09/B/ST9/00026]; [2012/07/B/ST9/04404]; [2013/09/B/ST9/00599]; [2017/27/B/ST9/01855]; NASA [75114, NNX12AF12G] Funding Source: Federal RePORTER | |
| dc.description.sponsorship | A.G. and M.O. acknowledge support from the Polish National Science Centre (NCN) through the grant 2012/04/A/ST9/00083. D.K.W. and A.G. acknowledge the support from 2013/09/B/ST9/00026. L.S. and V.M. are supported by Polish NSC grant UMO-2016/22/E/ST9/00061. M.S. acknowledges the support of 2012/07/B/ST9/04404. S.Z. acknowledges the support of 2013/09/B/ST9/00599 and 2017/27/B/ST9/01855. R.H. acknowledges GA CR grant 13-33324S. A.S. and M.So. were supported by National Aeronautics and Space Administration (NASA) contract NAS8-03060 (Chandra X-ray Center). M.So. also acknowledges Polish NCN grant OPUS 2014/13/B/ST9/00570. A. V.F. is grateful for support from National Science Foundation (NSF) grant AST-1211916, NASA grant NNX12AF12G, the TABASGO Foundation, the Christopher R. Redlich Fund, and the Miller Institute for Basic Research in Science (U.C. Berkeley). Research at Lick Observatory is partially supported by a generous gift from Google. This research has made use of data from the University of Michigan Radio Astronomy Observatory, which has been supported by the University of Michigan and by a series of grants from the NSF, most recently AST-0607523, and NASA Fermi grants NNX09AU16G, NNX10AP16G, and NNX11A013G. The OVRO 40 m Telescope Fermi Blazar Monitoring Program is supported by NASA under awards NNX08AW31G and NNX11A043G, and by the NSF under awards AST-0808050 and AST-1109911. Based on observations obtained with telescopes of the University Observatory Jena, which is operated by the Astrophysical Institute of the Friedrich-Schiller University. The Fermi-LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include NASA and the Department of Energy (DOE) in the United States, the Commissariat a l'Energie Atomique and the Centre National de la Recherche Scientifique/Institut National de Physique Nucleaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK), and Japan Aerospace Exploration Agency (JAXA) in Japan, and the KA Wallenberg Foundation, the Swedish Research Council, and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d'Etudes Spatiales in France. This work was performed in part under DOE Contract DE-AC02-765F00515. | |
| dc.identifier.doi | 10.3847/1538-4357/aad2de | |
| dc.identifier.issn | 0004-637X | |
| dc.identifier.issn | 1538-4357 | |
| dc.identifier.issue | 2 | |
| dc.identifier.scopus | 2-s2.0-85052370335 | |
| dc.identifier.scopusquality | Q1 | |
| dc.identifier.uri | https://doi.org/10.3847/1538-4357/aad2de | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12428/20753 | |
| dc.identifier.volume | 863 | |
| dc.identifier.wos | WOS:000442628400011 | |
| dc.identifier.wosquality | Q1 | |
| dc.indekslendigikaynak | Web of Science | |
| dc.indekslendigikaynak | Scopus | |
| dc.language.iso | en | |
| dc.publisher | Iop Publishing Ltd | |
| dc.relation.ispartof | Astrophysical Journal | |
| dc.relation.publicationcategory | info:eu-repo/semantics/openAccess | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.snmz | KA_WoS_20250125 | |
| dc.subject | acceleration of particles | |
| dc.subject | BL Lacertae objects: individual (OJ 287) | |
| dc.subject | galaxies: active | |
| dc.subject | magnetic fields | |
| dc.subject | radiation mechanisms: non-thermal | |
| dc.title | Stochastic Modeling of Multiwavelength Variability of the Classical BL Lac Object OJ287 on Timescales Ranging from Decades to Hours | |
| dc.type | Article |
