An extreme rotation measure in the high-redshift radio galaxy PKS B0529-549

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dc.creatorBroderick, J. W.
dc.creatorDe Breuck, C.
dc.creatorHunstead, R. W.
dc.creatorSeymour, N.
dc.date2006-12-06
dc.date.accessioned2026-07-07T10:21:10Z
dc.date.available2026-07-07T10:21:10Z
dc.descriptionWe present the results of a radio polarimetric study of the high-redshift radio galaxy PKS B0529-549 (z=2.575), based on high-resolution 12 mm and 3 cm images obtained with the Australia Telescope Compact Array (ATCA). The source is found to have a rest-frame Faraday rotation measure of -9600 rad m^{-2}, the largest seen thus far in the environment of a z > 2 radio galaxy. In addition, the rest-frame Faraday dispersion in the screen responsible for the rotation is calculated to be 5800 rad m^{-2}, implying rotation measures as large as -15400 rad m^{-2}. Using supporting near-IR imaging from the Very Large Telescope (VLT), we suggest that the rotation measure originates in the Ly-alpha halo surrounding the host galaxy, and estimate the magnetic field strength to be ~10 microGauss. We also present a new optical spectrum of PKS B0529-549 obtained with the New Technology Telescope (NTT), and propose that the emission-line ratios are best described by a photoionization model. Furthermore, the host galaxy is found to exhibit both hot dust emission at 8.0 microns and significant internal visual extinction (~1.6 mag), as inferred from Spitzer Space Telescope near/mid-IR imaging.
dc.description12 pages, 6 figures, accepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/astro-ph/0612143
dc.identifierhttp://arxiv.org/abs/astro-ph/0612143
dc.identifierMon.Not.Roy.Astron.Soc.375:1059-1069,2007
dc.identifierdoi:10.1111/j.1365-2966.2006.11375.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175083
dc.subjectAstrophysics
dc.titleAn extreme rotation measure in the high-redshift radio galaxy PKS B0529-549
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