Interferometric detection of the polarization of Sgr A* at 340 GHz

Details Interferometric detection of the polarization of Sgr A* at 340 GHz Interferometric detection of the polarization of Sgr A* at 340 GHz

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.3204m&link_type=abstract

American Astronomical Society Meeting 205, #32.04; Bulletin of the American Astronomical Society, Vol. 36, p.1398

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on high angular resolution (1-2 arcsec) interferometric measurements of the submillimeter polarization of Sgr A*. Using the Submillimeter Array, an interferometer located on Mauna Kea, Hawaii, we have measured a total flux of 2.6 Jy, with 6% linear polarization at a position angle of 170\degr. Similar polarization results were obtained in May and July, suggesting that we are observing a quiescent polarization state. Previous single dish measurements of the submillimeter polarization of Sgr A* were afflicted by polarized dust emission within the large JCMT beam (Aitken et al. ApJ 534, L173, 2000). These observations effectively eliminate this problem by reducing the beam solid angle by nearly two orders of magnitude, with the dust contamination reduced approximately proportionally. The measured polarization fraction is similar to that measured previously at 230 GHz with BIMA (Bower et al. ApJ, 588, 331, 2003), but much lower than the 13% measured by Aitken et al. The polarization fraction and position angle are consistent between our two sidebands, at 331.7 and 341.7 GHz. The difference in position angle between the two sidebands limits the rotation measure to 6× 105 rad m-2. This rotation measure is too low for simple ADAF models that also match the Sgr A* spectral energy distribution, confirming the result of Bower et al.

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