PoS - Proceedings of Science
Volume 401 - High Energy Astrophysics in Southern Africa 2021 (HEASA2021) - Session: Posters
Development of tools for SALT/RSS spectropolarimetry reductions: application to the blazar 3C279
J. Cooper*, B. van Soelen and R. Britto
Full text: Not available
Abstract
Blazars represent a subset of AGN with relativistic jets, where the direction of the jet lies very
close to our line of sight. The highly Doppler boosted emission from the blazar's jet results in
high apparent luminosities, and blazars display variability on periods from less than one day up
to years. At optical wavelengths, the observed emission of the blazar is a superposition of the
polarised non-thermal synchrotron emission, arising from the jet, and the unpolarised thermal
emission, arising from the disc, broad line region, torus and host galaxy.
Polarimetry observations can, therefore, serve as an important tool for diagnosing the emission
from blazars. The RSS spectrograph, on SALT, can operate in spectropolarimetry mode and is
currently being used to undertake spectropolarimetric observations of transient blazar sources.
We present additional tools developed to work in conjunction with the current SALT spectropolarimetry reduction pipeline, polsalt, that aims to streamline the reduction of the SALT polarisation data, including the testing of the wavelength calibration of the individual O and E beams. This was applied to observations of 3C 279 during 2017.
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