Faraday Depolarization Study of a Radio Galaxy Using LOFAR Two-metre Sky Survey: Data Release 2

We present a detailed depolarization analysis of the radio galaxy <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mtext mathvariant="monospace">𝙸𝙻𝚃𝙹𝟶𝟷𝟸𝟸𝟷𝟻.𝟸𝟷+𝟸𝟻𝟺𝟹𝟹𝟺.𝟾</mml:mtext> </mml:math> using polarimetric data from the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mtext mathvariant="italic">𝐿𝑂𝐹𝐴𝑅</mml:mtext> </mml:math> Two-metre Sky Survey} (LoTSS) Data Release 2 (DR2) catalogue. This source, with ~ 47 rad m and projected linear size ~ 335 kpc at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>z</mml:mi> <mml:mo>≈</mml:mo> <mml:mn>0.05</mml:mn> </mml:mrow> </mml:math> , serves as a pilot for systematic qu-fitting of mostly unresolved LoTSS sources, building on prior single-target studies that established the need for multi-component Faraday models in complex magneto-ionic media. Fitting five depolarization models to the LoTSS HBA (120-168 MHz) fractional polarization spectra reveals a decisively preferred three-component model (one Faraday-thin instrumental leakage, plus two external Faraday dispersions), demonstrating that LoTSS data alone can constrain moderate Faraday complexity in typical DR2 galaxies. Our results highlight turbulence and inhomogeneity in the foreground magneto-ionic medium and outline a path for population studies of LoTSS FR-I sources.