SIMBAD references

2017MNRAS.467.4631H - Mon. Not. R. Astron. Soc., 467, 4631-4646 (2017/June-1)

The Fan Region at 1.5 GHz - I. Polarized synchrotron emission extending beyond the Perseus Arm.

HILL A.S., LANDECKER T.L., CARRETTI E., DOUGLAS K., SUN X.H., GAENSLER B.M., MAO S.A., McCLURE-GRIFFITHS N.M., REICH W., WOLLEBEN M., DICKEY J.M., GRAY A.D., HAVERKORN M., LEAHY J.P. and SCHNITZELER D.H.F.M.

Abstract (from CDS):

The Fan Region is one of the dominant features in the polarized radio sky, long thought to be a local (distance <=500 pc) synchrotron feature. We present 1.3-1.8 GHz polarized radio continuum observations of the region from the Global Magneto-Ionic Medium Survey and compare them to maps of Hα and polarized radio continuum intensity from 0.408 to 353 GHz. The high-frequency (>1 GHz) and low-frequency (<=600 MHz) emissions have different morphologies, suggesting a different physical origin. Portions of the 1.5 GHz Fan Region emission are depolarized by ≃30 per cent by ionized gas structures in the Perseus Arm, indicating that this fraction of the emission originates >=2 kpc away. We argue for the same conclusion based on the high polarization fraction at 1.5 GHz (≃40 per cent). The Fan Region is offset with respect to the Galactic plane, covering -5° <= b <= +10°; we attribute this offset to the warp in the outer Galaxy. We discuss origins of the polarized emission, including the spiral Galactic magnetic field. This idea is a plausible contributing factor although no model to date readily reproduces all of the observations. We conclude that models of the Galactic magnetic field should account for the >=1 GHz emission from the Fan Region as a Galactic scale, not purely local, feature.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): polarization - ISM: magnetic fields - ISM: structure - Galaxy: structure - radio continuum: ISM - radio continuum: ISM

Simbad objects: 17

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2019.09.15-16:50:35

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