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

Herrera Ruiz, N.; O’Sullivan, S. P.; Vacca, V.; Jelić, Vibor; Nikiel- Wroczyński, B.; Bourke, S.; Sabater, J.; Dettmar, R.-J.; Heald, G.; Horellou, C.; Piras, S.; Sobey, C.; Shimwell, T. W.; Tasse, C.; Hardcastle, M. J.; Kondapally, R.; Chyży, K. T.; Iacobelli, M.; Best, P. N.; Brüggen, M.; Carretti, E.; Prandoni, I. (2021) LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1. Astronomy & Astrophysics, 648 . ISSN 0004-6361

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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 deg2 image with 1σQU sensitivity of 26 μJy 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 deg2. 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.

Item Type: Article
Uncontrolled Keywords: polarization ; galaxies: individual: ELAIS-N1 ; radio continuum: galaxies ; techniques: polarimetric
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Razumijevanje zračenja na niskim radio frekvencijama: ususret novoj generaciji radio teleskopaJelić, ViborIP-2018-01-2889HRZZ
Depositing User: Vibor Jelić
Date Deposited: 08 Sep 2021 13:16
Last Modified: 08 Sep 2021 13:16
URI: http://fulir.irb.hr/id/eprint/6546
DOI: 10.1051/0004-6361/202038896

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