Detection of Polarized Millimeter and Submillimeter Emission from Sagittarius A*
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 2000
- DOI:
- 10.1086/312685
- Bibcode:
- 2000ApJ...534L.173A
- Keywords:
-
- GALAXIES: INDIVIDUAL (SAGITTARIUS A*);
- GALAXY: CENTER;
- POLARIZATION