LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1
Journal
Date Issued
2021
Author(s)
Herrera Ruiz, N.
•
O'Sullivan, S. P.
•
•
Jelić, V.
•
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.
•
•
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.
Volume
648
Start page
A12
Issn Identifier
0004-6361
Ads BibCode
2021A&A...648A..12H
Rights
open.access
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