BIMA Observations of Linear Polarization in Sagittarius A* at 112 GHz
Geoffrey C. Bower(1,2), Melvyn C.H. Wright(2), Heino Falcke(3), Donald C. Backer(2)
(1) National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville, Socorro, NM 87801; gbower@nrao.edu
(2) Astronomy Department & Radio Astronomy Laboratory, University of California, Berkeley, CA 94720; gbower,mwright,dbacker@astro.berk eley.edu
(3) Max Planck Institut für Radioastronomie, Auf dem Hügel 69, D 53121 Bonn Germany; hfalcke@mpifr-bonn.mpg.de
Paper: ApJL, in press
Abstract:
We report here BIMA array observations of linear polarization in
Sagittarius A*, the compact radio source in the Galactic Center.
These observations had a resolution of 20'' *
5''
oriented North-South.
We do not detect linear or circular polarization at a level of 1.8%
(1- sigma ) at 112 GHz.
This puts a new constraint on models that show a sharp change in
linear polarization fraction at 100 GHz.
Preprints available from the authors at gbower@palan.berkeley.edu
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