Complex Structure of the Eastern Lobe of the Pictor A Radio Galaxy: Spectral Analysis and X-ray/Radio Correlations
R. Thimmappa, {\L}. Stawarz, U. Pajdosz-\'Smierciak, K., Balasubramaniam, V. Marchenko

TL;DR
This study provides a detailed spectral and correlation analysis of X-ray and radio features in the Eastern lobe of Pictor A, revealing a new filament with unique properties and insights into the lobe's magnetic and thermal structure.
Contribution
It introduces the discovery of a bright X-ray filament upstream of the jet termination, analyzing its properties and correlations with radio emission for the first time.
Findings
Identification of a new X-ray filament extending 30 kpc
Anti-correlation between X-ray brightness and polarized radio intensity
Decrease in radio rotation measure near the filament
Abstract
Here we present detailed analysis of the distinct X-ray emission features present within the Eastern radio lobe of the Pictor A galaxy, around the jet termination region, utilising the data obtained from the Chandra X-ray Observatory. Various emission features have been selected for the study based on their enhanced X-ray surface brightness, including five sources that appear point-like, as well as three extended regions, one characterised by a filamentary morphology. For those, we perform a basic spectral analysis within the 0.5-7keV range. We also investigate various correlations between the X-ray emission features and the non-thermal radio emission, utilising the high-resolution radio maps from the Very Large Array at GHz frequencies. The main novel findings following from our analysis, regard the newly recognized bright X-ray filament located upstream of the jet termination region,…
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