VLBI Monitoring of the bright gamma-ray blazar PKS 0537-441
Faith Hungwe, Roopesh Ojha, Matthias Kadler, Roy Booth, Jay Blanchard,, Jim Lovell, Cornelia Mueller, Moritz Boeck, the TANAMI team
TL;DR
This paper reports VLBI observations of the luminous, highly variable gamma-ray blazar PKS 0537-441, analyzing its milliarcsecond scale structure and spectral and temporal variability to understand its emission mechanisms.
Contribution
It provides high-resolution VLBI images and ongoing analysis of spectral and temporal changes in PKS 0537-441, a bright gamma-ray blazar, contributing new detailed structural data.
Findings
High-resolution 8.4 GHz and 22 GHz images of PKS 0537-441
Analysis of spectral and temporal variability ongoing
PKS 0537-441 remains one of the brightest gamma-ray blazars
Abstract
One of the defining characteristics of BL Lacertae objects is their strong variability across the electromagnetic spectrum. PKS 0537-441 is one such object and is one of the most luminous blazars from radio to gamma-ray wavelengths. It was detected as a strong and highly variable source by EGRET and has been reported several times to be in an active state by Fermi . It is one of the brightest gamma-ray blazars detected in the southern sky so far. The TANAMI (Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry) program is monitoring PKS 0537-441 at VLBI resolutions. We present 8.4 GHz and 22 GHz images of the milliarcsecond scale structure. We also present our ongoing analysis of the spectral and temporal changes in this object.
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