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Correlation between optical and γ-ray flux variations in BL Lacs




TekijätRajput Bhoomika, Shah Zahir, Stalin C.S., Sahayanathan S., Rakshit Suvendu

KustantajaOxford University Press

Julkaisuvuosi2021

JournalMonthly Notices of the Royal Astronomical Society

Vuosikerta504

Numero2

Aloitussivu1772

Lopetussivu1786

eISSN1365-2966

DOIhttps://doi.org/10.1093/mnras/stab970

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/66471504


Tiivistelmä

We report here results of the analysis of correlated flux variations between the optical and GeV γ-ray bands in three bright BL Lac objects, namely AO 0235+164, OJ 287, and PKS 2155−304. This was based on the analysis of about 10 yr of data from the Fermi Gamma-ray Space Telescope covering the period between 2008 August 8 and 2018 August 8 along with optical data covering the same period. For all the sources, during the flares analysed in this work, the optical and γ-ray flux variations are found to be closely correlated. From broad-band spectral energy distribution modelling of different epochs in these sources using the one-zone leptonic emission model, we found that the optical–ultraviolet emission is dominated by synchrotron emission from the jet. The γ-ray emission in the low synchrotron peaked sources AO 0235+164 and OJ 287 is found to be well fitted with external Compton (EC) component, while the γ-ray emission in the high synchrotron peaked source PKS 2155−304 is well fitted with synchrotron self-Compton component. Further, we note that the γ-ray emission during the high-flux state of AO 0235+164 (epochs A and B) requires seed photons from both the dusty torus and broad-line region, while the γ-ray emission in OJ 287 and during epochs C and D of AO 0235+164 can be modelled by EC scattering of infrared photons from the torus.


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