The polarization properties of sgr A* at submillimeter wavelengths

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

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

Abstract

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 publicationESO Astrophysics Symposia
Pages163-169
Number of pages7
Volume2008
DOIs
StatePublished - 2008
Externally publishedYes

Publication series

NameESO Astrophysics Symposia
Volume2008
ISSN (Print)14312433
ISSN (Electronic)16116143

Fingerprint

polarization
wavelengths
radii
energy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Physics and Astronomy (miscellaneous)

Cite this

Moran, J. M., Marrone, D. P., Zhao, J. H., & Rao, R. (2008). The polarization properties of sgr A* at submillimeter wavelengths. In ESO Astrophysics Symposia (Vol. 2008, pp. 163-169). (ESO Astrophysics Symposia; Vol. 2008). https://doi.org/10.1007/978-3-540-74713-0_37

The polarization properties of sgr A* at submillimeter wavelengths. / Moran, J. M.; Marrone, Daniel P; Zhao, J. H.; Rao, R.

ESO Astrophysics Symposia. Vol. 2008 2008. p. 163-169 (ESO Astrophysics Symposia; Vol. 2008).

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

Moran, JM, Marrone, DP, Zhao, JH & Rao, R 2008, The polarization properties of sgr A* at submillimeter wavelengths. in ESO Astrophysics Symposia. vol. 2008, ESO Astrophysics Symposia, vol. 2008, pp. 163-169. https://doi.org/10.1007/978-3-540-74713-0_37
Moran JM, Marrone DP, Zhao JH, Rao R. The polarization properties of sgr A* at submillimeter wavelengths. In ESO Astrophysics Symposia. Vol. 2008. 2008. p. 163-169. (ESO Astrophysics Symposia). https://doi.org/10.1007/978-3-540-74713-0_37
Moran, J. M. ; Marrone, Daniel P ; Zhao, J. H. ; Rao, R. / The polarization properties of sgr A* at submillimeter wavelengths. ESO Astrophysics Symposia. Vol. 2008 2008. pp. 163-169 (ESO Astrophysics Symposia).
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