Rapid Optical Fluctuations in the Black Hole Binary V4641 Sagittarii
Rapid Optical Fluctuations in the Black Hole Binary V4641 Sagittarii
Abstract We report on unprecedented short-term variations detected in the optical flux from the black hole binary system, V4641 Sgr. The amplitudes of the optical fluctuations were larger at longer time scales, and surprisingly reached $ \sim 60\%$ around a period of $ \sim10 \,\mathrm{min}$. The power spectra of the …