Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427...77k&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 77
Physics
1
Polarization, Instrumentation: Polarimeters, Techniques: Polarimetric, Minor Planets, Asteroids, Ism: Supernova Remnants, Quasars: Individual: 3C 279
Scientific paper
ISOPHOT provided unique polarization capabilities in the FIR. The 1 σ accuracy of linear polarization is 1% for sources with total fluxes of few Jy. For the first time the polarization of a quasar was measured: 3C 279 showed a high polarization of 23% half a year after a γ-ray flare with a decrease to 6.5% one year later, but with equal total flux. A consistent polarization of 8% between 25 and 170 μm was found for the Crab nebula. It is considerably lower than expected from mm-polarization measurements. This could indicate the presence of unpolarized IR emission from lines and/or dust. This interpretation is not unambiguous, however, as the angle of polarization in the IR differs from that in the radio. The non-detection of polarization for asteroids with highly elongated shapes places new constraints on their surface properties.
Clavel Jean
Klaas Ulrich
Krätschmer Wolfgang
Kreysa Ernst
Lagerros Johan S. V.
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