Lofar deep fields: Probing a broader population of polarized radio galaxies in elais-n1
Artikel i vetenskaplig tidskrift, 2021

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.

Techniques: Polarimetric


Radio continuum: Galaxies

Galaxies: Individual: ELAIS-N1


N. Herrera Ruiz

Ruhr-Universität Bochum

Shane P. O'Sullivan

Dublin City University

V. Vacca

INAF Osservatorio Astronomico di Cagliari

V. Jelić

Ruder Boskovic Institute

B. Nikiel-Wroczyński

Uniwersytet Jagiellonski w Krakowie

Stephen Bourke

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

J. Sabater

Royal Observatory

R. -J. Dettmar

Ruhr-Universität Bochum

G. Heald

CSIRO Astronomy and Space Science

Cathy Horellou

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Sara Piras

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

C. Sobey

CSIRO Astronomy and Space Science

T. W. Shimwell

Netherlands Institute for Radio Astronomy (ASTRON)

C. Tasse

Rhodes University

Observatoire de Paris-Meudon

Centre national de la recherche scientifique (CNRS)

M. J. Hardcastle

University of Hertfordshire

R. Kondapally

Royal Observatory

K.T. Chyz̊y

Uniwersytet Jagiellonski w Krakowie

M. Iacobelli

Netherlands Institute for Radio Astronomy (ASTRON)

P. N. Best

Royal Observatory

M. Brueggen

Universität Hamburg

E. Carretti

INAF OAS Bologna

I. Prandoni

INAF OAS Bologna

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 648 A12


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik




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