Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*

Details Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A* Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...534l.173a&link_type=abstract

The Astrophysical Journal, Volume 534, Issue 2, pp. L173-L176.

Astronomy and Astrophysics

Astronomy

100

Galaxies: Individual (Sagittarius A*), Galaxy: Center, Polarization

Scientific paper

We report the detection of linear polarization from Sgr A* at 750, 850, 1350, and 2000 μm which confirms the contribution of synchrotron radiation. From the lack of polarization at longer wavelengths, it appears to arise in the millimeter/submillimeter excess. There are large position angle changes between the millimeter and submillimeter results, and these are discussed in terms of a polarized dust contribution in the submillimeter and various synchrotron models. In the model that best explains the data, the synchrotron radiation from the excess is self-absorbed in the millimeter region and becomes optically thin in the submillimeter. This implies that the excess arises in an extremely compact source of ~2 Schwarzschild radii.

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