Multiwavelength behaviour of the blazar OJ 248 from radio to γ -rays

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101305

Title:	Multiwavelength behaviour of the blazar OJ 248 from radio to γ -rays
Authors:	陳文屏;Carnerero, M. I.;Raiteri, C. M.;Villata, M.;Acosta-Pulido, J. A.;D'Ammando, F.;Smith, P. S.;Larionov, V. M.;Agudo, I.;Arévalo, M. J.;Arkharov, A. A.;Bach, U.;Bachev, R.;Benítez, E.;Blinov, D. A.;Bozhilov, V.;Buemi, C. S.;Bueno Bueno, A.;Carosati, D.;Casadio, C.;Chen, W. P.;Damljanovic, G.;Paola, A. Di;Efimova, N. V.;Ehgamberdiev, Sh. A.;Giroletti, M.;Gómez, J. L.;González-Morales, P. A.;Grinon-Marin, A. B.;Grishina, T. S.;Gurwell, M. A.;Hiriart, D.;Hsiao, H. Y.;Ibryamov, S.;Jorstad, S. G.;Joshi, M.;Kopatskaya, E. N.;Kurtanidze, O. M.;Kurtanidze, S. O.;Lähteenmäki, A.;Larionova, E. G.;Larionova, L. V.;Lázaro, C.;Leto, P.;Lin, C. S.;Lin, H. C.;Manilla-Robles, A. I.;Marscher, A. P.;McHardy, I. M.;Metodieva, Y.;Mirzaqulov, D. O.;Mokrushina, A. A.;Molina, S. N.;Morozova, D. A.;Nikolashvili, M. G.;Orienti, M.;Ovcharov, E.;Panwar, N.;Pastor Yabar, A.;Puerto Giménez, I.;Ramakrishnan, V.;Richter, G. M.;Rossini, M.;Sigua, L. A.;Strigachev, A.;Taylor, B.;Tornikoski, M.;Trigilio, C.;Troitskaya, Yu. V.;Troitsky, I. S.;Umana, G.;Valcheva, A.;Velasco, S.;Vince, O.;Wehrle, A. E.;Wiesemeyer, H.
Contributors:	理學院天文研究所
Keywords:	Blazars;Correlation;Emission analysis;Mathematical analysis;Observatories;Outbursts;Polarization;Radio
Date:	2015-01-01
Issue Date:	2026-04-21 14:30:05 (UTC+8)
Publisher:	Oxford University Press
Abstract:	摘要： We present an analysis of the multiwavelength behaviour of the blazar OJ 248 at z = 0.939 in the period 2006–2013. We use low-energy data (optical, near-infrared, and radio) obtained by 21 observatories participating in the Gamma-Ray Large Area Space Telescope (GLAST)-AGILE Support Program of the Whole Earth Blazar Telescope, as well as data from the Swift (optical–UV and X-rays) and Fermi (γ-rays) satellites, to study flux and spectral variability and correlations among emissions in different bands. We take into account the effect of absorption by the Damped Lyman α intervening system at z = 0.525. Two major outbursts were observed in 2006–2007 and in 2012–2013 at optical and near-IR wavelengths, while in the high-frequency radio light curves prominent radio outbursts are visible peaking at the end of 2010 and beginning of 2013, revealing a complex radio–optical correlation. Cross-correlation analysis suggests a delay of the optical variations after the γ-ray ones of about a month, which is a peculiar behaviour in blazars. We also analyse optical polarimetric and spectroscopic data. The average polarization percentage P is less than 3 per cent, but it reaches ∼19 per cent during the early stage of the 2012–2013 outburst. A vague correlation of P with brightness is observed. There is no preferred electric vector polarization angle and during the outburst the linear polarization vector shows wide rotations in both directions, suggesting a complex behaviour/structure of the jet and possible turbulence. The analysis of 140 optical spectra acquired at the Steward Observatory reveals a strong Mg ii broad emission line with an essentially stable flux of 6.2 × 10− 15 erg cm− 2 s− 1 and a full width at half-maximum of 2053 km s− 1. 其他題名： Mon. Not. R. Astron. Soc 出版者： Oxford University Press 出版日期： 2015-07-01 出處： Monthly notices of the Royal Astronomical Society, 2015-07, Vol.450 (3), p.2677-2691 資源來源： Alma/SFX Local Collection 版權： 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2015 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-8711 識別號： ISSN: 1365-2966 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stv823
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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