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Galaxies 2017, 5(3), 52;

SALT Spectropolarimetry and Self-Consistent SED and Polarization Modeling of Blazars

Centre for Space Research, North-West University, Potchefstroom 2520, South Africa
Department of Physics, University of the Free State, Bloemfontein 9300, South Africa
South African Astronomical Observatory, Cape Town—Observatory 7935, South Africa
Based on observations made with the Southern African Large Telescope (SALT) under programme 2016-2-LSP-001 (PI: D. A. H. Buckley).
For the Fermi-LAT collaboration.
Author to whom correspondence should be addressed.
Academic Editors: Emmanouil Angelakis and Jose L. Gómez
Received: 31 July 2017 / Revised: 6 September 2017 / Accepted: 7 September 2017 / Published: 11 September 2017
(This article belongs to the Special Issue Polarised Emission from Astrophysical Jets)
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We report on recent results froma target-of-opportunity program to obtain spectropolarimetry observations with the Southern African Large Telescope (SALT) on flaring gamma-ray blazars. SALT spectropolarimetry and contemporaneous multi-wavelength spectral energy distribution (SED) data are being modelled self-consistently with a leptonic single-zone model. Such modeling provides an accurate estimate of the degree of order of the magnetic field in the emission region and the thermal contributions (from the host galaxy and the accretion disk) to the SED, thus putting strong constraints on the physical parameters of the gamma-ray emitting region. For the specific case of the γ -ray blazar 4C+01.02, we demonstrate that the combined SED and spectropolarimetry modeling constrains the mass of the central black hole in this blazar to M BH 10 9 M . View Full-Text
Keywords: active galaxies: blazars; gamma-rays; polarization: optical; spectropolarimetry active galaxies: blazars; gamma-rays; polarization: optical; spectropolarimetry

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Böttcher, M.; van Soelen, B.; Britto, R.J.; Buckley, D.A.H.; Marais, J.P.; Schutte, H. SALT Spectropolarimetry and Self-Consistent SED and Polarization Modeling of Blazars. Galaxies 2017, 5, 52.

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