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High-Frequency Measurements of the Spectrum of Sagittarius A*
We report near-simultaneous interferometric measurements of the spectrum of Sagittarius A* over the 5-354 GHz range and single-dish observations that have yielded the first detection of Sgr A* at 850 GHz. We confirm that Sgr A*'s spectrum rises more steeply at short millimeter wavelengths than at centimeter wavelengths, leading to a near-millimeter/submillimeter excess that dominates its luminosity. Below 900 GHz, Sgr A*'s observed luminosity is 70 ע 30 L . A new upper limit to Sgr A*'s 24.3doi:10.1086/311010 fatcat:xhr5zszrcnd4hmatabtabf7juu