Rapid Variability of Sgr A* across the Electromagnetic Spectrum

Understand

Sagittarius A* (Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source associated with accretion onto the Galactic center black hole.

• We have analyzed a comprehensive submillimeter (including new observations simultaneous with NIR monitoring), NIR, and 2-8 keV dataset.
• Submillimeter variations tend to lag those in the NIR by $\sim$30 minutes.
• An approximate Bayesian computation (ABC) fit to the X-ray first-order structure function shows significantly less power at short timescales in the X-rays than in the NIR.