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Long-term Multiband Near-infrared Variability of the Blazar OJ 287 during 2007-2021
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- Gupta, Alok C. (author)
- Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Nainital, India.;Shanghai Frontiers Sci Ctr Gravitat Wave Detect, 800 Dongchuan Rd, Shanghai 200240, Peoples R China.
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- Kushwaha, Pankaj (author)
- Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Nainital, India.;Indian Inst Sci Educ & Res Mohali, Dept Phys Sci, Sect 81, Sas Nagar 140306, Punjab, India.;Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210033, Jiangsu, Peoples R China.
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- Carrasco, L. (author)
- Inst Nacl Astrofis Opt & Electr, Luis Enrique Erro 1, Puebla 72840, Mexico.
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- Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Nainital, India;Shanghai Frontiers Sci Ctr Gravitat Wave Detect, 800 Dongchuan Rd, Shanghai 200240, Peoples R China. Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Nainital, India.;Indian Inst Sci Educ & Res Mohali, Dept Phys Sci, Sect 81, Sas Nagar 140306, Punjab, India.;Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210033, Jiangsu, Peoples R China. (creator_code:org_t)
- 2022-06-17
- 2022
- English.
- In: Astrophysical Journal Supplement Series. - : American Astronomical Society. - 0067-0049 .- 1538-4365. ; 260:2, s. 39-
- Journal article (peer-reviewed)
Abstract
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- We present the most extensive and well-sampled long-term multiband near-infrared (NIR) temporal and spectral variability study of OJ 287, considered to be the best candidate binary supermassive black hole blazar. These observations were made between 2007 December and 2021 November. The source underwent similar to 2-2.5 mag variations in the J, H, and Ks NIR bands. Over these long-term timescales there were no systematic trends in either flux or spectral evolution with time or with the source's flux states. However, on shorter timescales, there are significant variations in flux and spectra indicative of strong changes during different activity states. The NIR spectral energy distributions show diverse facets at each flux state, from the lowest to the highest. The spectra are, in general, consistent with a power-law spectral profile (within 10%) and many of them indicate minor changes (observationally insignificant) in the shift of the peak. The NIR spectra generally steepen during bright phases. We briefly discuss these behaviors in the context of blazar emission scenarios/mechanisms, OJ 287's well-known traditional behavior, and implications for models of the source central engine invoked for its long-term optical semiperiodic variations.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- Gupta, Alok C.
- Kushwaha, Pankaj
- Carrasco, L.
- Xu, Haiguang
- Wiita, Paul J.
- Escobedo, G.
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- Porras, A.
- Recillas, E.
- Mayya, Y. D.
- Chavushyan, V.
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- Zhang, Zhongli
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