Title:	Broadband modelling of Orphan gamma ray flares
Authors:	Patel, S.R. Bose, D. Gupta, Nayantara Zuberi, M.
Keywords:	Flat spectrum radio quasars γ-rays Spectral energy distribution Non-thermal radiative mechanism
Issue Date:	Mar-2021
Publisher:	Elsevier
Citation:	Journal of High Energy Astrophysics, 2021, Vol.29, p31–39
Abstract:	Blazars, a class of highly variable active galactic nuclei, sometimes exhibit Orphan γ-ray flares. These flares having high flux only in γ-ray energies do not show significant variations in flux at lower energies. We study the temporal and spectral profile of these Orphan γ-ray flares in detail from three γ−raybright blazars, 3C273, PKS1510-089 and 3C279 and also their simultaneous broadband emissions. We find that the variability timescales of the Orphan γ-ray flares were (0.96 ±0.28)days, (3.12 ±2.40)hr and (2.16 ±0.72)hr, for 3C273, PKS1510-089 and 3C279, respectively. The broadband spectral energy distributions (SEDs) during these flares have been modelled with a leptonic model from two emission regions. This model suggests that Orphan γ-ray flares might have originated from inverse Compton scattering of relativistic electrons by the seed photons from the broad-line region or dusty torus, which is the first region. While the second broader region, lying further down the jet, could be responsible for X-ray and radio emissions. The possible locations of these emission regions in the jets of the three sources have been estimated from SED modelling.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/7758
ISSN:	2214-4048
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2021JHEAp..29...31P/abstract https://arxiv.org/abs/2012.10291 https://doi.org/10.1016/j.jheap.2020.12.001
Copyright:	2020 Elsevier B.V.
Appears in Collections:	Research Papers (A&A)

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