The Linear Polarization of Sagittarius A* II., VLA and BIMA Polarimetry at 22, 43 and 86 GHz
Geoffrey C. Bower(1,2), Melvyn C.H. Wright(3), Donald C. Backer(3), & Heino Falcke(2)
(1) National Radio Astronomy Observatory, P.O. Box O, 1003 Lopezville, Socorro, NM 87801
(2) Max Planck Institut für Radioastronomie, Auf dem Hügel 69, D 53121 Bonn Germany
(3) Astronomy Department & Radio Astronomy Laboratory, University of California, Berkeley, CA 94720
Paper: accepted for publication in ApJ
Abstract:
We present a search for linear polarization at 22 GHz, 43 GHz and 86
GHz from the nearest super massive black hole candidate, Sagittarius A*.
We find upper limits to the
linear polarization of 0.2%, 0.4% and 1%, respectively. These
results strongly support the conclusion of our centimeter wavelength
spectro-polarimetry that Sgr A* is not depolarized by the interstellar
medium but is in fact intrinsically depolarized.
Preprints available from the authors at gbower@vegas.aoc.nrao.edu
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