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Paper: A Detection of Sgr A* in the Far Infrared
Volume: 528, New Horizons in Galactic Center Astronomy and Beyond
Page: 203
Authors: von Fellenberg, S. D.; Gillessen, S.; Graciá-Carpio, J.; Fritz, T. K.; Dexter, J.; Bauböck, M.; Ponti, G.; Gao, F.; Habibi, M.; Plewa, P. M.; Pfuhl, O.; Jimenez-Rosales, A.; Waisberg, I.; Widmann, F.; Ott, T.; Eisenhauer, F.; Genzel, R.
Abstract: We report the first detection of the Galactic Centre massive black hole, Sgr A*, at 100 and 160 μm. Our measurements were obtained with PACS on board the Herschel satellite at 100 μ m and 160 μm. We measure a significant and simultaneous variation of its flux of Δ Fν=160μm =(0.27±0.06) Jy and Δ Fν=100 μm =(0.16±0.10) Jy during one observation. The significance level of the 160 μ m band variability is 4.5σ and the corresponding 100 μm band variability is significant at 1.6σ. We find no example of an equally significant false positive detection. Conservatively assuming a variability of 25% in the FIR, we can provide upper limits to the flux. The upper limits are consistent with modern ALMA and VLA observations. Our upper limits provide further evidence for a spectral peak at ∼ 1012 Hz and constrain the number density of γ100 electrons in the accretion disk and or outflow.
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