Issue |
A&A
Volume 609, January 2018
|
|
---|---|---|
Article Number | L3 | |
Number of page(s) | 7 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/201732203 | |
Published online | 09 February 2018 |
Letter to the Editor
The magnetic environment of the Orion-Eridanus superbubble as revealed by Planck
1
Max-Planck-Institute for Astronomy,
Königstuhl 17,
69117
Heidelberg, Germany
e-mail: soler@mpia.de
2
Nordita, KTH Royal Institute of Technology and Stockholm University,
Roslagstullsbacken 23,
10691
Stockholm, Sweden
e-mail: andrea.bracco@su.se
3
Laboratoire AIM, Paris-Saclay, CEA/IRFU/SAp – CNRS – Université Paris Diderot,
91191
Gif-sur-Yvette Cedex, France
4
Department of Physics and Astronomy, University of Western Ontario,
1151 Richmond Street,
London,
ON
N6A 3K7, Canada
Received:
30
October
2017
Accepted:
8
December
2017
Using the 353-GHz polarization observations by the Planck satellite we characterize the magnetic field in the Orion-Eridanus superbubble, a nearby expanding structure that spans more than 1600 square degrees in the sky. We identify a region of both low dispersion of polarization orientations and high polarization fraction associated with the outer wall of the superbubble identified in the most recent models of the large-scale shape of the region. We use the Davis-Chandrasekhar-Fermi method to derive plane-of-the-sky magnetic field strengths of tens of μG toward the southern edge of the bubble. The comparison of these values with existing Zeeman splitting observations of HI in emission suggests that the large-scale magnetic field in the region was primarily shaped by the expanding superbubble.
Key words: magnetic fields / stars: formation / ISM: bubbles / ISM: individual objects: Orion-Eridanus Superbubble / polarization / Galaxy: disk
© ESO, 2018
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