About Open Access
Modeling the Magnetic Field in the Galactic Disk Using New Rotation Measure Observations from the Very Large Array
Lookup NU author(s)
Professor Anvar Shukurov
Van Eck CL, Brown JC, Stil JM, Rae K, Mao SA, Gaensler BM, Shukurov A, Taylor AR, Haverkorn M, Kronberg PP, McClure-Griffiths NM
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
We have determined 194 Faraday rotation measures (RMs) of polarized extragalactic radio sources using new, multi-channel polarization observations at frequencies around 1.4 GHz from the Very Large Array in the Galactic plane at 17° <= l <= 63° and 205° <= l <= 253°. This catalog fills in gaps in the RM coverage of the Galactic plane between the Canadian Galactic Plane Survey and Southern Galactic Plane Survey. Using this catalog we have tested the validity of recently proposed axisymmetric and bisymmetric models of the large-scale (or regular) Galactic magnetic field, and found that of the existing models we tested, an axisymmetric spiral model with reversals occurring in rings (as opposed to along spiral arms) best matched our observations. Building on this, we have performed our own modeling, using RMs from both extragalactic sources and pulsars. By developing independent models for the magnetic field in the outer and inner Galaxy, we conclude that in the inner Galaxy, the magnetic field closely follows the spiral arms, while in the outer Galaxy, the field is consistent with being purely azimuthal. Furthermore, the models contain no reversals in the outer Galaxy, and together seem to suggest the existence of a single reversed region that spirals out from the Galactic center.
Institute of Physics Publishing, Inc.
Altmetrics provided by
Newcastle University Library, NE2 4HQ, United Kingdom. Tel: 0044 (191) 222 7657
©2017 Newcastle University Library