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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29075
Title: S-PASS/ATCA: a window on the magnetic universe in the Southern hemisphere
Authors: Schnitzeler, D. H. F. M.
CARRETTI, ETTORE 
Wieringa, M. H.
Gaensler, B. M.
Haverkorn, M.
POPPI, Sergio 
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 485
Issue: 1
First Page: 1293
Abstract: We present S-PASS/ATCA, the first wide-band radio polarimetry survey of compact sources in the Southern sky. We describe how we selected targets for observations with the Australia Telescope Compact Array (ATCA) in the 16-cm band (1.3-3.1 GHz), our observing and calibration strategy, how we analysed the data, and how we tested the quality of the data. The data are made publicly available. The survey contains on average one source per five square degrees and has an angular resolution at 2.2 GHz of ∼2'× 1'. Sources with |RM|s > 150 rad m<SUP>-2</SUP> are seen towards the Galactic plane and bright H II regions, but are rare elsewhere on the sky. Sightlines that are separated by up to 3' show very similar RMs. Based on this observation, we argue that the Galactic foreground is the dominant contributor to RM, confirming previous results, and that the sources must have very simple distributions of Faraday-rotating and synchrotron-emitting media. Many sources that emit at a single RM have a spectral index in linear polarization that is (very) different from the spectral index in Stokes I. Analysing ratios of flux densities Q/I and U/I (to correct for spectral index effects) then leads to erroneous results. About 80 per cent of sightlines in our survey are dominated by emission at only 1 RM. Therefore, RMs that were determined previously from narrow-band observations at these frequencies are still safe to use.
URI: http://hdl.handle.net/20.500.12386/29075
URL: https://academic.oup.com/mnras/article-abstract/485/1/1293/5287993?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/stz092
Bibcode ADS: 2019MNRAS.485.1293S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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