2006ApJ...637L..33H

Query : 2006ApJ...637L..33H

2006ApJ...637L..33H - Astrophys. J., 637, L33-L35 (2006/January-3)

Enhanced small-scale Faraday rotation in the galactic spiral arms.

HAVERKORN M., GAENSLER B.M., BROWN J.C., BIZUNOK N.S., McCLURE-GRIFFITHS N.M., DICKEY J.M. and GREEN A.J.

Abstract (from CDS):

We present an analysis of the rotation measures (RMs) of polarized extragalactic point sources in the Southern Galactic Plane Survey. This work demonstrates that the statistics of fluctuations in RM differ for the spiral arms and the interarm regions. Structure functions of RM are flat in the spiral arms, while they increase in the interarms. This indicates that there are no correlated RM fluctuations in the magnetoionized interstellar medium in the spiral arms on scales larger than ∼0°.5, corresponding to ∼17 pc in the nearest spiral arm probed. The nonzero slopes in interarm regions imply a much larger scale of RM fluctuations. We conclude that fluctuations in the magnetoionic medium in the Milky Way spiral arms are not dominated by the mainly supernova-driven turbulent cascade in the global ISM but are probably due to a different source, most likely H II regions.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - ISM: Magnetic Fields - ISM: Structure - Radio Continuum: ISM - Techniques: Polarimetric - Turbulence

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Car Arm PoG 10 00 -60.0           ~ 471 1

Query : 2006ApJ...637L..33H

Basic data :
NAME Car Arm -- Part of a Galaxy
Other object types: otypes_help 		PoG ()
ICRS coord. (ep=J2000) : 		10 00 00.0 -60 00 00 [ ] E ~
FK4 coord. (ep=B1950 eq=1950) : 		09 58 24.2 -59 45 34 [ ]
Gal coord. (ep=J2000) : 		282.9998 -03.9394 [ ]
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Identifiers (3) :
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NAME Car Arm NAME Carina Arm NAME Carina Spiral Arm

References (471 between 1850 and 2026) (Total 471)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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