Herrera Ruiz, N.N.Herrera RuizO'Sullivan, S. P.S. P.O'SullivanVACCA, VALENTINAVALENTINAVACCAJelić, V.V.JelićNikiel-Wroczyński, B.B.Nikiel-WroczyńskiBourke, S.S.BourkeSabater, J.J.SabaterDettmar, R. -J.R. -J.DettmarHeald, G.G.HealdHorellou, C.C.HorellouPiras, S.S.PirasSobey, C.C.SobeyShimwell, T. W.T. W.ShimwellTasse, C.C.TasseHardcastle, M. J.M. J.HardcastleKondapally, R.R.KondapallyChyży, K. T.K. T.ChyżyIacobelli, M.M.IacobelliBest, P. N.P. N.BestBrüggen, M.M.BrüggenCARRETTI, ETTOREETTORECARRETTIPRANDONI, ISABELLAISABELLAPRANDONI2022-06-102022-06-1020210004-6361http://hdl.handle.net/20.500.12386/32269We 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<SUP>2</SUP> image with 1σ<SUB>QU</SUB> sensitivity of 26 μJy beam<SUP>−1</SUP> 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<SUP>2</SUP>. 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.STAMPAenArticle10.1051/0004-6361/2020388962-s2.0-85104021724https://www.aanda.org/articles/aa/full_html/2021/04/aa38896-20/aa38896-20.htmlhttps://arxiv.org/abs/2011.082922021A&A...648A..12HFIS/05 - ASTRONOMIA E ASTROFISICA