SIMBAD references

2007MNRAS.375.1059B - Mon. Not. R. Astron. Soc., 375, 1059-1069 (2007/March-1)

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


Abstract (from CDS):

We 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. The source is found to have a rest-frame Faraday rotation measure of -9600 rad/m2, 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/m2, implying rotation measures as large as -15400 rad/m2. Using supporting near-infrared (near-IR) imaging from the Very Large Telescope, we suggest that the rotation measure originates in the Lyα halo surrounding the host galaxy, and estimate the magnetic field strength to be ∼10µG. We also present a new optical spectrum of PKS B0529-549 obtained with the New Technology Telescope, 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 µm and significant internal visual extinction (∼1.6 mag), as inferred from Spitzer Space Telescope near/mid-IR imaging.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): polarization - galaxies: active - galaxies: high-redshift - galaxies: individual: PKS B0529-549 - radio continuum: galaxies

Nomenclature: Table 2, Fig.1: [BDH2007] B0529-549 W (Nos W, E).

Simbad objects: 13

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