Broad-band radio polarimetry of disc galaxies and AGN with KAT-7

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dc.contributor.authorTaylor, A
dc.contributor.authorLegodi, L
dc.contributor.authorStil, J
dc.date.accessioned2021-04-20T15:10:05Z
dc.date.available2021-04-20T15:10:05Z
dc.date.issued2020-10-24
dc.description.abstractWe report broad-band (1.2–1.9 GHz) radio continuum observations at arcminute resolutions of two nearby disc galaxies, NGC 1808 and NGC 1097, and four active galactic nuclei (AGN)-powered radio sources: PKS B1934−638, PKS B0407−658, J0240−231, and J0538−440. We use rotation measure synthesis to analyse their Faraday complexity. Observations were made with the seven-dish Karoo Array Telescope (KAT-7) radio telescope array, in South Africa. The AGN-powered sources fall into two ‘Faraday’ categories – simple and complex. The most polarized sources, J0538−440 and J0240−231, are found to have complex Faraday spectra that can be time variable (J0538−440 case) and also indicative of complex Faraday emitting and rotating components along the line of sight. PKS B0407−658 shows a simple Faraday spectrum, while PKS B1934−638 is undetected in polarization. The disc galaxies are classified as complex, albeit at low signal-to-noise ratio. This may indicate depolarization due to turbulence of the magnetized plasma in the bar and circumnuclear regions and/or frequency-dependent depolarization at L band.en_US
dc.identifier.citationLegodi, L. S; Taylor, A. R; Stil, J. 2020. M.,Broad-band radio polarimetry of disc galaxies and AGN with KAT-7. Monthly Notices of the Royal Astronomical Society.500(1):576-589en_US
dc.identifier.urihttp://doi.org/10.1093/mnras/staa3266
dc.identifier.urihttp://hdl.handle.net/10566/6091
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.subjectpolarization – galaxiesen_US
dc.subjectmagnetic fieldsen_US
dc.subjectradio continuumen_US
dc.subjectgalaxiesen_US
dc.titleBroad-band radio polarimetry of disc galaxies and AGN with KAT-7en_US
dc.typeArticleen_US

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