Formation of Episodic Jets and Associated Flares from Black Hole Accretion Systems

Episodic ejections of blobs (episodic jets) are widely observed in black hole sources and usually associated with flares. In this paper, by performing analyzing three dimensional general relativity magnetohydrodynamical numerical simulations accretion flows, we investigate their physical mechanisms. We find that magnetic reconnection occurs the flow, likely due to turbulent motion differential rotation resulting flares formation flux ropes. Flux ropes formed inside 10-15 gravitational radii found mainly stay within while beyond radius ejected outward forces form episodic jets. These results confirm basic scenario proposed Yuan et al.(2009). Moreover, our predicted velocity is good consistency observations Sgr A*, M81, M87. The whole processes occur quasi-periodically, period being orbital time at where rope formed. consistent those from light curves or image M87, PKS 1510-089. possible applications protostellar systems discussed.