Other
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..562c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 2, p. 562-569
Other
42
Astronomical Polarimetry, Energy Spectra, Galactic Radiation, Light (Visible Radiation), Polarization (Waves), Radio Galaxies, Scattering, Spectral Energy Distribution, Ultraviolet Radiation, Anisotropy, Astronomical Models, Bosons, Infrared Radiation, Interstellar Matter, Mathematical Models, Nuclear Radiation, Relativity
Scientific paper
We present the results of optical imaging polarimetry of a radio galaxy at z = 2.63. High linear polarization (P = 8.3 +/- 2.3%) is measured in the rest frame UV continuum between 1600 and 2100 A. The orientation of the electic vector is perpendicular to the UV and Lyman alpha axis and, as for the other known polarized distant radio galaxies, scattering of anisotropic nuclear radiation is the favored polarization mechanism. We discuss modeling of the observed degree of polarization and of the spectral energy distribution of the galaxy as given by optical and infrared photometry, with evolved stars, young stars, anisotropic nuclear light scattered by dust or electrons, and direct nuclear radiation. The presence of the scattered component is required by the high UV polarization. Nevertheless it is not possilbe to exclude young stars or direct nuclear radiation solely on the basis of the photometric fitting. Also an evolved stellar population is necessary to explain the infrared colors. We discuss a possible test of the Einstein equivalence principle and of the presence of a light pseudoscalar boson based on the preservation of photon polarization orientation over large distances.
Cimatti Andrea
de Serego Alighieri Sperello
Field George B.
Fosbury Robert A. E.
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