Simultaneous Multi-Wavelength Observations of Sgr A* during 2007 April 1-11
F. Yusef-Zadeh, H. Bushouse, M. Wardle, C. Heinke, D. A. Roberts, C.D., Dowell, A. Brunthaler, M. J. Reid, C. L. Martin, D. P. Marrone, D. Porquet,, N. Grosso, K. Dodds-Eden, G. C. Bower, H. Wiesemeyer, A. Miyazaki, S. Pal, S., Gillessen, A. Goldwurm, G. Trap, H. Maness

TL;DR
This study presents multi-wavelength observations of Sgr A* revealing correlated flares in near-IR, X-ray, and radio, with evidence of time delays and localization within the inner accretion region, advancing understanding of black hole emission mechanisms.
Contribution
It provides the first direct evidence of hour-scale flares localized within the inner 30×70 Schwarzschild radii of Sgr A* and demonstrates correlated multi-wavelength flare activity with time delays.
Findings
Detection of three new flares in near-IR and X-ray bands.
First direct evidence of radio flares localized within the inner accretion region.
Observation of time delays up to three hours between different wavelength peaks.
Abstract
We report the detection of variable emission from Sgr A* in almost all wavelength bands (i.e. centimeter, millimeter, submillimeter, near-IR and X-rays) during a multi-wavelength observing campaign. Three new moderate flares are detected simultaneously in both near-IR and X-ray bands. The ratio of X-ray to near-IR flux in the flares is consistent with inverse Compton scattering of near-IR photons by submillimeter emitting relativistic particles which follow scaling relations obtained from size measurements of Sgr A*. We also find that the flare statistics in near-IR wavelengths is consistent with the probability of flare emission being inversely proportional to the flux. At millimeter wavelengths, the presence of flare emission at 43 GHz (7mm) using VLBA with milli-arcsecond spatial resolution indicates the first direct evidence that hourly time scale flares are localized within the…
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