The High Redshift Blazar S5 0836+71: A Broadband Study

Abstract

A broadband study of the high redshift blazar S5 0836+71 (z = 2.172) is presented. Multi-frequency light curves show multiple episodes of X-ray and $\gamma$-ray flares, while optical-UV fluxes show little variations. During the GeV outburst, the highest $\gamma$-ray flux measured is (5.22 $\pm$ 1.10) $\times$ 10${}^{-6}$ ph cm${}^{-2}$ s${}^{-1}$ in the range of 0.1-300 GeV, which corresponds to an isotropic $\gamma$-ray luminosity of (1.62 $\pm$ 0.44) $\times$ 10${}^{50}$ erg s${}^{-1}$, thereby making this as one of the most luminous $\gamma$-ray flare ever observed from any blazar. A fast $\gamma$-ray flux rising time of $\sim$3 hours is also noticed which is probably the first measurement of hour scale variability detected from a high redshift (z > 2) blazar. The various activity states of S5 0836+71 are reproduced under the assumption of single zone leptonic emission model. In all the states, the emission region is located inside the broad line region, and the optical-UV radiation is dominated by the accretion disk emission. The modeling parameters suggests the enhancement in bulk Lorentz factor as a primary cause of the $\gamma$-ray flare. The high X-ray activity with less variable $\gamma$-ray counterpart can be due to emission region to be located relatively closer to the black hole where the dominating energy density of the disk emission results in higher X-ray flux due to inverse-Compton scattering of disk photons.

41 pages, 9 figures, 6 tables, to appear in The Astrophysical Journal. arXiv admin note: text overlap with arXiv:1501.07363

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Cited by in corpus (7)

• The Central Engines of Fermi Blazars
• NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
• Multiwavelength Study of High-Redshift Blazars
• Detection of a gamma-ray flare from the high-redshift blazar DA 193
• A NuSTAR view of powerful gamma-ray loud blazars
• Radio VLBA polarization and multi-band monitoring of the high-redshift quasar S5 0836+710 during a high activity period
• Origin of multiwavelength emission from flaring high redshift blazar PKS 0537-286