TY - JOUR
T1 - Revealing the Faraday depth structure of radio galaxy NGC612 with broad-band radio polarimetric observations
AU - Kaczmarek, J. F.
AU - Purcell, C. R.
AU - Gaensler, B. M.
AU - Sun, X.
AU - O'Sullivan, S. P.
AU - McClure-Griffiths, N. M.
PY - 2018/5/11
Y1 - 2018/5/11
N2 - We present full-polarization, broad-band observations of the radio galaxy NGC612 (PKS B0131-637) from 1.3 to 3.1 GHz using the Australia Telescope Compact Array. The relatively large angular scale of the radio galaxy makes it a good candidate with which to investigate the polarization mechanisms responsible for the observed Faraday depth structure. By fitting complex polarization models to the polarized spectrum of each pixel, we find that a single polarization component can adequately describe the observed signal for the majority of the radio galaxy. While we cannot definitively rule out internal Faraday rotation, we argue that the bulk of the Faraday rotation is taking place in a thin skin that girts the polarized emission. Using minimum energy estimates, we find an implied total magnetic field strength of 4.2 μG.
AB - We present full-polarization, broad-band observations of the radio galaxy NGC612 (PKS B0131-637) from 1.3 to 3.1 GHz using the Australia Telescope Compact Array. The relatively large angular scale of the radio galaxy makes it a good candidate with which to investigate the polarization mechanisms responsible for the observed Faraday depth structure. By fitting complex polarization models to the polarized spectrum of each pixel, we find that a single polarization component can adequately describe the observed signal for the majority of the radio galaxy. While we cannot definitively rule out internal Faraday rotation, we argue that the bulk of the Faraday rotation is taking place in a thin skin that girts the polarized emission. Using minimum energy estimates, we find an implied total magnetic field strength of 4.2 μG.
KW - Galaxies: individual: NGC612
KW - Galaxies: magnetic fields
KW - Radio continuum: galaxies
KW - Techniques: polarimetric
UR - http://www.scopus.com/inward/record.url?scp=85052108688&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/FL100100114
U2 - 10.1093/MNRAS/STY269
DO - 10.1093/MNRAS/STY269
M3 - Article
AN - SCOPUS:85052108688
SN - 0035-8711
VL - 476
SP - 1596
EP - 1613
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -