We report on results of a multiband monitoring campaign from radio to γ -rays of the high-redshift flat spectrum radio quasar S5 0836 + 710 during a high-activity period detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. Two major flares were detected, in 2015 August and November. In both episodes, the apparent isotropic γ - ray luminosity exceeds 1050 erg s−1, with a doubling time-scale of about 3 h. The high γ -ray activity may be related to a superluminal knot that emerged from the core in 2015 April at the peak of the radio activity and is moving downstream along the jet. The low variability observed in X-rays may indicate that X-ray emission is produced by the low-energy tail of the same electron population that produces the γ -ray emission. The analysis of full-polarization pc-scale radio observations suggests the presence of a limb-brightened polarization structure at about 1 mas from the core in which a rotation measure gradient with a sign change is observed transverse to the jet direction. These characteristics are consistent with a scenario in which Faraday rotation is produced by a sheath of thermal electrons with a toroidal magnetic field surrounding the emitting jet.

Orienti M., D'Ammando F., Giroletti M., Dallacasa D., Giovannini G., Ciprini S. (2020). Radio VLBA polarization and multiband monitoring of the high-redshift quasar S5 0836 + 710 during a high-activity period. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 491(1), 858-873 [10.1093/mnras/stz2949].

Radio VLBA polarization and multiband monitoring of the high-redshift quasar S5 0836 + 710 during a high-activity period

Dallacasa D.;Giovannini G.;
2020

Abstract

We report on results of a multiband monitoring campaign from radio to γ -rays of the high-redshift flat spectrum radio quasar S5 0836 + 710 during a high-activity period detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. Two major flares were detected, in 2015 August and November. In both episodes, the apparent isotropic γ - ray luminosity exceeds 1050 erg s−1, with a doubling time-scale of about 3 h. The high γ -ray activity may be related to a superluminal knot that emerged from the core in 2015 April at the peak of the radio activity and is moving downstream along the jet. The low variability observed in X-rays may indicate that X-ray emission is produced by the low-energy tail of the same electron population that produces the γ -ray emission. The analysis of full-polarization pc-scale radio observations suggests the presence of a limb-brightened polarization structure at about 1 mas from the core in which a rotation measure gradient with a sign change is observed transverse to the jet direction. These characteristics are consistent with a scenario in which Faraday rotation is produced by a sheath of thermal electrons with a toroidal magnetic field surrounding the emitting jet.
2020
Orienti M., D'Ammando F., Giroletti M., Dallacasa D., Giovannini G., Ciprini S. (2020). Radio VLBA polarization and multiband monitoring of the high-redshift quasar S5 0836 + 710 during a high-activity period. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 491(1), 858-873 [10.1093/mnras/stz2949].
Orienti M.; D'Ammando F.; Giroletti M.; Dallacasa D.; Giovannini G.; Ciprini S.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/864211
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