Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1414p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #14.14; Bulletin of the American Astronomical Society, Vol. 39, p.761
Astronomy and Astrophysics
Astronomy
Scientific paper
What are the properties of the Galactic magnetic field in the Outer Milky Way? What is the degree of uniformity of magnetic field structure with distance away from the Galactic disk midplane? Observations designed to answer these questions would also test models of the formation and maintenance of the Galactic magnetic field. A limited outer Galaxy survey was designed to examine nine 10'x10’ fields centered on L=150° and extending above and below the galactic plane at B=±10°, ±5°, ±2.5°, ±1.25°, and 0°. The survey uses the Mimir near-infrared imager-polarimeter on the 1.8m Perkins telescope outside Flagstaff, AZ. in wide-field polarimetry mode. These maps reveal magnetically aligned anisotropic dust grain polarizations which trace the direction of the magnetic field projected onto the plane of the sky. An initial observing run with short exposures in 2007 October measured the polarizations for all stars in the nine fields down to H=12. A second observing run with deeper exposures in 2007 November will trace polarizations for stars to H=14. This two-tier observing plan extends the brightness range of measured polarizations, and so probes a larger range of line of sight distances.
This research is partially supported by NSF grants AST-0440936 and -0607500.
Clemens Dan P.
Pavel Michael D.
Pinnick April
Taylor Barrie
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