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LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1

Abstract : We present deep polarimetric observations of the European Large Area ISO Survey-North 1 (ELAIS-N1) field using the Low Frequency Array (LOFAR) at 114.9–177.4 MHz. The ELAIS-N1 field is part of the LOFAR Two-metre Sky Survey deep fields data release I. For six eight-hour observing epochs, we align the polarization angles and stack the 20″-resolution Stokes Q , U -parameter data cubes. This produces a 16 deg 2 image with 1 σ QU sensitivity of 26 μ Jy beam −1 in the central area. In this paper, we demonstrate the feasibility of the stacking technique, and we generate a catalog of polarized sources in ELAIS-N1 and their associated Faraday rotation measures (RMs). While in a single-epoch observation we detect three polarized sources, this number increases by a factor of about three when we consider the stacked data, with a total of ten sources. This yields a surface density of polarized sources of one per 1.6 deg 2 . The Stokes I images of three of the ten detected polarized sources have morphologies resembling those of FR I radio galaxies. This represents a greater fraction of this type of source than previously found, which suggests that more sensitive observations may help with their detection.
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Submitted on : Wednesday, January 19, 2022 - 8:41:03 AM
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N. Herrera Ruiz, S. O’sullivan, V. Vacca, V. Jelić, B. Nikiel-Wroczyński, et al.. LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1. Astronomy and Astrophysics - A&A, EDP Sciences, 2021, 648, pp.A12. ⟨10.1051/0004-6361/202038896⟩. ⟨hal-03532916⟩

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