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Properties of Polarized Radio Sources in the Wide Chandra Deep Field South from 2 to 4 GHz

Year: 2026
Type: article
Abstract: We present a study of the linear polarization properties of radio sources within the 10 deg2. Wide Chandra Deep Field South (W-CDFS) in S-band (2–4 GHz). Our W-CDFS image has an angular resolution of 15 arcsec and a 1σ RMS in Stokes I of ≈50 μJy/beam. We detect 1920 distinct source components in Stokes I and 175 in linear polarization. We examine the polarized source counts, Faraday Rotation measures, and fractional polarization of the sources in the survey. We show that sources with a total intensity above ≈10 mJy have a mean fractional polarization value of ≈3% from modeling the polarized counts. We also calculate an estimate for the limit on the fractional polarization level of sources with a total intensity below 1 mJy (mostly star-forming galaxies) of ≲3% using stacking. The mean Faraday Rotation we measure is consistent with that due to the Milky Way. We also show that fractional polarization is correlated with in-band spectral index, consistent with a lower mean fractional polarization for the flat-spectrum population. In addition to characterizing the S-band polarization properties of sources in the W-CDFS, this study will be used to validate the shallower, but higher angular resolution S-band polarimetric information that the VLA Sky Survey will provide for the whole sky above Declination −40 degrees over the next few years.
Source: Universe
DOI: 10.3390/universe12020038
Authors: Samantha Adams, Mark Lacy, Preshanth Jagannathan, Jose Afonso, William Nielsen Brandt, B. M. Gaensler, Evanthia Hatziminaoglou, Anna Kapinska, Josh Marvil, Hugo Messias, Steve Myers, Ray Norris, Kristina Nyland, Wiphu Rujopakarn, Nick Seymour, Mattia Vaccari, Rick White
Institutions: University of Connecticut, University of Rhode Island, National Radio Astronomy Observatory, University of Lisbon, Pennsylvania State University, University of California, Santa Cruz, European Southern Observatory, Universidad de La Laguna, Instituto de Astrofísica de Canarias, Atacama Large Millimeter Submillimeter Array, European Southern Observatory, Commonwealth Scientific and Industrial Research Organisation, Western Sydney University, United States Naval Observatory, Chulalongkorn University, Curtin University, University of Cape Town, Space Telescope Science Institute
Language: English
Open Access status: gold
Estimated APC paid: $1,930
OpenAlex ID: W7125968758
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Cites: 51
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