dc.contributor.author |
Rajput, Bhoomika |
|
dc.contributor.author |
Shah, Zahir |
|
dc.contributor.author |
Stalin, C. S |
|
dc.contributor.author |
Sahayanathan, S |
|
dc.contributor.author |
Rakshit, S |
|
dc.date.accessioned |
2021-07-16T05:24:26Z |
|
dc.date.available |
2021-07-16T05:24:26Z |
|
dc.date.issued |
2021-06 |
|
dc.identifier.citation |
Monthly Notices of the Royal Astronomical Society, Vol. 504, No. 2, pp. 1772–1786 |
en_US |
dc.identifier.issn |
1365-2966 |
|
dc.identifier.uri |
http://hdl.handle.net/2248/7779 |
|
dc.description |
Restricted Access |
en_US |
dc.description.abstract |
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. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Oxford University Press on behalf of the Royal Astronomical Society |
en_US |
dc.rights |
© The Royal Astronomical Society |
|
dc.rights.uri |
https://doi.org/10.1093/mnras/stab970 |
|
dc.subject |
Galaxies: active |
en_US |
dc.subject |
BL Lacertae objects: general |
en_US |
dc.subject |
Galaxies: jets |
en_US |
dc.title |
Correlation between optical and γ-ray flux variations in BL Lacs |
en_US |
dc.type |
Article |
en_US |