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Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..343..503j&link_type=abstract
Astronomical Polarimetry: Current Status and Future Directions ASP Conference Series, Vol. 343, Proceedings of the Conference he
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1
Scientific paper
Imaging polarimetry at near infrared wavelengths can probe the magnetic field geometry in external galaxies in regions of high extinction inaccessible to optical techniques. Polarization of starlight from deep into dustlanes, blowouts, and dust enshrouded nuclei can be measured. A total of twelve galaxies showing only interstellar polarization have been observed to date. Normal galaxies such as NGC 4565 show a magnetic field geometry lying in the plane of the disk and a polarization strength very similar to what is observed in the Milky Way. Ultraluminous galaxies and galaxies with starburst nuclei show a polar magnetic field geometry in the nucleus, causing a crossed polaroid effect and reduced polarization. Interestingly, galaxies with active disks, but otherwise normal, such as NGC 891 show the effects of blowouts in the polarization maps.
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