Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414l..21t&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 414, no. 1, p. L21-L24.
Astronomy and Astrophysics
Astrophysics
73
Electron Scattering, H Alpha Line, Interstellar Matter, Linear Polarization, Supernovae, Astronomical Polarimetry, Astronomical Spectroscopy, Spectrum Analysis
Scientific paper
We have obtained low-resolution optical spectropolarimetry of SN 1993J which shows a high continuum linear polarization and a 0.5 percent drop in polarization across the H-alpha emission line accompanied by a position angle rotation of approximately 15 deg. From these data we infer the presence of two distinct polarization components and conclude that at least part of the polarization is intrinsic to the supernova. We propose that the polarization observed at H-alpha is due to interstellar polarization within NGC 3031, while the continuum polarization is intrinsic to the object. After correcting the observed Stokes parameters for interstellar polarization, we find that the intrinsic continuum polarization is high, P = 1.6 +/- 0.1 percent at theta = 49 deg +/- 3 deg, and is wavelength-independent. The Stokes flux displays blueshifted H-alpha absorption which suggests that the polarization is generated primarily in the underlying continuum source.
Hines Dean Carter
Trammell Susan Rebecca
Wheeler Justin C.
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