Galactic interstellar filaments as probed by LOFAR and Planck

Zaroubi, S.; Jelić, Vibor; de Bruyn, A. G.; Boulanger, F.; Bracco, A.; Kooistra, R.; Alves, M. I. R.; Brentjens, M. A.; Ferrière, K.; Ghosh, T.; Koopmans, L. V. E.; Levrier, F.; Miville-Deschênes, M.- A.; Montier, L.; Pandey, V. N.; Soler, J. D. (2015) Galactic interstellar filaments as probed by LOFAR and Planck. Monthly Notices of the Royal Astronomical Society, 454 (1). L46-L50. ISSN 0035-8711

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Abstract

Recent Low-Frequency Array (LOFAR) observations at 115-175 MHz of a field at medium Galactic latitudes (centred at the bright quasar 3C196) have shown striking filamentary structures in polarization that extend over more than 4° across the sky. In addition, the Planck satellite has released full sky maps of the dust emission in polarization at 353 GHz. The LOFAR data resolve Faraday structures along the line of sight, whereas the Planck dust polarization maps probe the orientation of the sky projected magnetic field component. Hence, no apparent correlation between the two is expected. Here we report a surprising, yet clear, correlation between the filamentary structures, detected with LOFAR, and the magnetic field orientation, probed by the Planck satellite. This finding points to a common, yet unclear, physical origin of the two measurements in this specific area in the sky. A number of follow-up multifrequency studies are proposed to shed light on this unexpected finding.

Item Type:	Article
Additional Information:	This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S. Zaroubi et al. (2015) Galactic interstellar filaments as probed by LOFAR and Planck. Monthly Notices of the Royal Astronomical Society. 454 (1): L46-L50 is available online at: http://mnrasl.oxfordjournals.org/content/454/1/L46.full.pdf.
Uncontrolled Keywords:	techniques: interferometric; ISM: general; ISM: magnetic fields; ISM: structure; radio continuum: general; submillimetre: ISM
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions:	Division of Experimental Physics
Depositing User:	Vibor Jelić
Date Deposited:	14 Oct 2015 13:13
URI:	http://fulir.irb.hr/id/eprint/2160
DOI:	10.1093/mnrasl/slv123

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