Speaker
Description
We present a polarimetric study at 114.9–177.4 MHz of the European Large Area ISO Survey-North 1 (ELAIS-N1) deep
field, one of the deepest of the LOFAR Two-Meter Sky Survey (LoTSS) Deep Fields so far. An area of 25 deg2 was imaged at 6”-resolution in the Stokes Q,U parameters. A 1σ sensitivity of 17 µJy/beam was reached in the central part by aligning the polarization angles and stacking datasets from 19 eight-hour-long epochs taken in two different observing cycles.
A search for polarization was carried out in the final stacked dataset and the properties of the detected sources were examined, resulting in the deepest and highest-resolution polarization study at 150 MHz to date.
32 polarized sources were detected, of which six were not detected at any other radio frequency before. The sources are weakly polarized, with a median degree of polarization of 1.75%. Most of them are FRII radio galaxies.
The depolarization of sources known to be polarized at 1.4 GHz was quantified and used to constrain models of polarized source counts at 150 MHz.
