Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-18
Astrophys.J. 618 (2004) L29-L32
Astronomy and Astrophysics
Astrophysics
accepted for publication in ApJL
Scientific paper
10.1086/427498
We report the discovery of variability in the linear polarization from the Galactic Center black hole source, Sagittarius A*. New polarimetry obtained with the Berkeley-Illinois-Maryland Association array at a wavelength of 1.3 mm shows a position angle that differs by 28 +/- 5 degrees from observations 6 months prior and then remains stable for 15 months. This difference may be due to a change in the source emission region on a scale of 10 Schwarzschild radii or due to a change of 3 x 10^5 rad m^-2 in the rotation measure. We consider a change in the source physics unlikely, however, since we see no corresponding change in the total intensity or polarized intensity fraction. On the other hand, turbulence in the accretion region at a radius ~ 10 to 1000 R_s could readily account for the magnitude and time scale of the position angle change.
Backer Donald C.
Bower Geoffrey C.
Falcke Heino
Wright Melvyn C. H.
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