CONFIRMATION OF A FARADAY ROTATION MEASURE ANOMALY IN CYGNUS

Catherine A Whiting; Steven R Spangler; Laura D Ingleby; L. Matthew Haffner

doi:10.1088/0004-637X/694/2/1452

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CONFIRMATION OF A FARADAY ROTATION MEASURE ANOMALY IN CYGNUS

Journal article

Peer reviewed

CONFIRMATION OF A FARADAY ROTATION MEASURE ANOMALY IN CYGNUS

Catherine A Whiting, Steven R Spangler, Laura D Ingleby and L. Matthew Haffner

The Astrophysical journal, Vol.694(2), pp.1452-1463

2009

DOI: 10.1088/0004-637X/694/2/1452

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Abstract

We confirm the reality of a reversal of the sign of the Faraday rotation measure in the Galactic plane in Cygnus (Lazio et al. 1990), possibly associated with the Cygnus OB1 association. The rotation measure changes by several hundred rad m−2 over an angular scale of 2°–5°. We show that a simple model of an expanding plasma shell with an enhanced density and magnetic field can account for the magnitude and angular scale of this feature. This model is consistent with observations of Hα emission as well as other observations in this part of sky. We suggest that this structure is physically associated with a superbubble produced by the Cygnus OB1 association.

Astronomy

Earth, ocean, space

Exact sciences and technology

Details

Title: Subtitle: CONFIRMATION OF A FARADAY ROTATION MEASURE ANOMALY IN CYGNUS
Creators: Catherine A Whiting - University of Iowa
Steven R Spangler - University of Iowa
Laura D Ingleby - University of Iowa
L. Matthew Haffner - University of Wisconsin–Madison
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.694(2), pp.1452-1463
DOI: 10.1088/0004-637X/694/2/1452
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 2009
Academic Unit: Physics and Astronomy
Record Identifier: 9984199846002771

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