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| Paper: |
ALMA and VLA Measurements of Frequency-Dependent Time Lags in Sagittarius A*: Evidence for a Relativistic Outflow |
| Volume: |
499, Revolution in Astronomy with ALMA: The Third Year |
| Page: |
167 |
| Authors: |
Brinkerink, C. D. |
| Abstract: |
Using ALMA and the VLA, we have measured simultaneous light curves of Sgr A* across a broad frequency range to constrain the speed of the radio-emitting plasma in the vicinity of the black hole. We detected and fit the maxima of an observed minor flare where flux density varied by ∼10%. The fitted times at frequencies from 100 GHz to 19 GHz reveal a simple frequency-dependent time lag relation where maxima at higher frequencies lead those at lower frequencies. Using the size-frequency relation of Sgr A*, these time lags suggest a moderately relativistic (lower estimates: 0.5c for two-sided, 0.77c for one-sided) collimated outflow. |
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