The polarization properties of sgr A* at submillimeter wavelengths

J. M. Moran, D. P. Marrone, J. H. Zhao, R. Rao

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have placed an upper limit on the magnitude of the rotation measure of 7 × 105 rad m-2 for the putative Faraday screen (magnetized plasma) in front of Sgr A*, the radio source associated with the black hole in the Galactic Center. There is evidence that the actual rotation measure is about -5 × 105 rad m-2. With a simple model of equipartition of energy and reasonable inner radius for the screen, the accretion rate is estimated to be less than 10-6 M yr -1. In addition, we have detected, for the first time, intra-day variability in the polarization of Sgr A*, which may be due to either intrinsic variations in Sgr A* or variations in the composition of the Faraday screen.

Original languageEnglish (US)
Title of host publicationRelativistic Astrophysics Legacy and Cosmology - Einstein's
Subtitle of host publicationProceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005
EditorsBernd Aschenbach, Vadim Burwitz, Gunther Hasinger, Bruno Leibundgut
Number of pages7
StatePublished - 2008

Publication series

NameESO Astrophysics Symposia
ISSN (Print)1431-2433
ISSN (Electronic)1611-6143

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Physics and Astronomy (miscellaneous)


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