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24 April 2024

» arxiv » 2011.08292

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LOFAR Deep Fields: Probing a broader population of polarized radio galaxies in ELAIS-N1
N. Herrera Ruiz ; S. P. O'Sullivan ; V. Vacca ; V. Jelić ; B. Nikiel-Wroczyński ; S. Bourke ; J. Sabater ; R.-J. Dettmar ; G. Heald ; C. Horellou ; S. Piras ; C. Sobey ; T. W. Shimwell ; C. Tasse ; M. J. Hardcastle ; R. Kondapally ; K. T. Chyży ; M. Iacobelli ; P. N. Best ; M. Brüggen ; E. Carretti ; I. Prandoni ;
Date:	16 Nov 2020
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$sigma_{ m QU}$ sensitivity of 26 $mu$Jy/beam 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.
Source:	arXiv, 2011.08292
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