Multiwavelength behaviour of the blazar OJ 248 from radio to ? -rays
Por:
Carnerero, MI, Raiteri, CM, Villata, M, AcostaPulido, JA, D'Ammando, F, Smith, PS, Larionov, VM, Agudo, I, Arevalo, MJ, Arkharov, AA, Bach, U, Bachev, R, Benitez, E, Blinov, DA, Bozhilov, V, Buemi, CS, Bueno, AB, Carosati, D, Casadio, C, Chen, WP, Damljanovic, G, Di Paola, A, Efimova, NV, Ehgamberdiev, SA, Giroletti, M, Gomez, JL, GonzalezMorales, PA, GrinonMarin, AB, Grishina, TS, Gurwell, MA, Hiriart, D, Hsiao, HY, Ibryamov, S, Jorstad, SG, Joshi, M, Kopatskaya, EN, Kurtanidze, OM, Kurtanidze, SO, Lahteenmaki, A, Larionova, EG, Larionova, LV, Lazaro, C, Leto, P, Lin, CS, Lin, HC, ManillaRobles, AI, Marscher, AP, McHardy, IM, Metodieva, Y, Mirzaqulov, DO, Mokrushina, AA, Molina, SN, Morozova, DA, Nikolashvili, MG, Orienti, M, Ovcharov, E, Panwar, N, Yabar, AP, Gimenez, IP, Ramakrishnan, V, Richter, GM, Rossini, M, Sigua, LA, Strigachev, A, Taylor, B, Tornikoski, M, Trigilio, C, Troitskaya, YV, Troitsky, IS, Umana, G, Valcheva, A, Velasco, S, Vince, O, Wehrle, AE, Wiesemeyer, H
Publicada:
1 jul 2015
Resumen:
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 (? -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 a 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. Crosscorrelation analysis suggests a delay of the optical variations after the ? -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.Avague 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. © 2015 The Authors.
Filiaciones:
Benitez, E:
Univ Nacl Autonoma Mexico, Astron Inst, Mexico City 04510, DF, Mexico
Hiriart, D:
Univ Nacl Autonoma Mexico, Inst Astron, Ensenada 22800, Baja California, Mexico
All Open Access, Bronze
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