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http://hdl.handle.net/20.500.12386/32269
Title: | LOFAR Deep Fields: probing a broader population of polarized radio galaxies in ELAIS-N1 | Authors: | Herrera Ruiz, N. O'Sullivan, S. P. VACCA, VALENTINA 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. CARRETTI, ETTORE PRANDONI, ISABELLA |
Issue Date: | 2021 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 648 | First Page: | A12 | 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<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. | URI: | http://hdl.handle.net/20.500.12386/32269 | URL: | https://www.aanda.org/articles/aa/full_html/2021/04/aa38896-20/aa38896-20.html https://arxiv.org/abs/2011.08292 |
ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/202038896 | Bibcode ADS: | 2021A&A...648A..12H | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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2011.08292.pdf | postprint | 1.83 MB | Adobe PDF | View/Open |
aa38896-20.pdf | PDF editoriale | 2.11 MB | Adobe PDF | View/Open |
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