Volume 648, April 2021
The LOFAR Two Meter Sky Survey
|Number of page(s)||13|
|Section||Catalogs and data|
|Published online||07 April 2021|
LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1
Faculty of Physics and Astronomy, Astronomical Institute, Ruhr University Bochum,
2 School of Physical Sciences and Centre for Astrophysics & Relativity, Dublin City University, Glasnevin, D09 W6Y4, Ireland
3 INAF – Osservatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius (CA), Italy
4 Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
5 Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
6 Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 439 92 Onsala, Sweden
7 SUPA, Institute for Astronomy, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
8 CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia
9 ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, The Netherlands
10 GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France
11 Centre for Radio Astronomy Techniques and Technologies, Department of Physics and Electronics, Rhodes University, Grahamstown 6140, South Africa
12 USN, Observatoire de Paris, CNRS, PSL, UO, Nançay, France
13 Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
14 Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
15 INAF-IRA, Via P. Gobetti 101, 40129 Bologna, Italy
Accepted: 22 August 2020
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.
Key words: polarization / galaxies: individual: ELAIS-N1 / radio continuum: galaxies / techniques: polarimetric
© ESO 2021
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