The polarization properties of sgr A* at submillimeter wavelengths

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

doi:10.1007/978-3-540-74713-0_37

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 proceeding › Conference 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 language	English (US)
Title of host publication	Relativistic Astrophysics Legacy and Cosmology - Einstein's
Subtitle of host publication	Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005
Editors	Bernd Aschenbach, Vadim Burwitz, Gunther Hasinger, Bruno Leibundgut
Pages	163-169
Number of pages	7
DOIs	https://doi.org/10.1007/978-3-540-74713-0_37
State	Published - 2008
Externally published	Yes

Publication series

Name	ESO Astrophysics Symposia
Volume	2008
ISSN (Print)	1431-2433
ISSN (Electronic)	1611-6143

ASJC Scopus subject areas

Astronomy and Astrophysics
Physics and Astronomy (miscellaneous)

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10.1007/978-3-540-74713-0_37

Cite this

Moran, J. M., Marrone, D. P., Zhao, J. H., & Rao, R. (2008). The polarization properties of sgr A* at submillimeter wavelengths. In B. Aschenbach, V. Burwitz, G. Hasinger, & B. Leibundgut (Eds.), Relativistic Astrophysics Legacy and Cosmology - Einstein's: Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005 (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, D. P.; Zhao, J. H. et al.
Relativistic Astrophysics Legacy and Cosmology - Einstein's: Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005. ed. / Bernd Aschenbach; Vadim Burwitz; Gunther Hasinger; Bruno Leibundgut. 2008. p. 163-169 (ESO Astrophysics Symposia; Vol. 2008).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Moran, JM, Marrone, DP, Zhao, JH & Rao, R 2008, The polarization properties of sgr A* at submillimeter wavelengths. in B Aschenbach, V Burwitz, G Hasinger & B Leibundgut (eds), Relativistic Astrophysics Legacy and Cosmology - Einstein's: Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005. 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 Aschenbach B, Burwitz V, Hasinger G, Leibundgut B, editors, Relativistic Astrophysics Legacy and Cosmology - Einstein's: Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005. 2008. p. 163-169. (ESO Astrophysics Symposia). doi: 10.1007/978-3-540-74713-0_37

Moran, J. M. ; Marrone, D. P. ; Zhao, J. H. et al. / The polarization properties of sgr A* at submillimeter wavelengths. Relativistic Astrophysics Legacy and Cosmology - Einstein's: Proceedings of the MPE/USM/MPA/ESO Joint Astronomy Conference Held in Munich, Germany, 7-11 November 2005. editor / Bernd Aschenbach ; Vadim Burwitz ; Gunther Hasinger ; Bruno Leibundgut. 2008. pp. 163-169 (ESO Astrophysics Symposia).

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AB - 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.

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The polarization properties of sgr A* at submillimeter wavelengths

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