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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29054
Title: Ghost of a shell: magnetic fields of Galactic supershell GSH 006 - 15 + 7
Authors: Thomson, Alec J. M.
McClure-Griffiths, N. M.
Federrath, Christoph
Dickey, John M.
CARRETTI, ETTORE 
Gaensler, B. M.
Haverkorn, Marijke
Kesteven, M. J.
Staveley-Smith, Lister
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 479
Issue: 4
First Page: 5620
Abstract: We identify a counterpart to a Galactic supershell in diffuse radio polarization, and use this to determine the magnetic fields associated with this object. GSH 006 - 15 + 7 has perturbed the polarized emission at 2.3 GHz, as observed in the S-band Polarization All Sky Survey (S-PASS), acting as a Faraday screen. We model the Faraday rotation over the shell, and produce a map of Faraday depth over the area across it. Such models require information about the polarized emission behind the screen, which we obtain from the Wilkinson Microwave Anisotropy Probe (WMAP), scaled from 23 to 2.3 GHz, to estimate the synchrotron background behind GSH 006 - 15 + 7. Using the modelled Faraday thickness, we determine the magnitude and the plane-of-the-sky structure of the line-of-sight magnetic field in the shell. We find a peak line-of-sight field strength of |B_allel |_peak=2.0^{+0.01 }_{ -0.7} μG. Our measurement probes weak magnetic fields in a low-density regime (number densities of {∼ }0.4 cm<SUP>-3</SUP>) of the ISM, thus providing crucial information about the magnetic fields in the partially-ionized phase.
URI: http://hdl.handle.net/20.500.12386/29054
URL: https://academic.oup.com/mnras/article-abstract/479/4/5620/5056214?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/sty1865
Bibcode ADS: 2018MNRAS.479.5620T
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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