Formation and Evolution of Transient Jets and Their Cavities in Black Hole X-Ray Binaries

Abstract We propose a model explaining the origin of transient/episodic jets in black hole X-ray binaries, which they are caused by transitions from collimated, strongly magnetized jet to wide, uncollimated outflow. The change occurs when accretion flow leaves magnetically choked state due an increase rate for weakly varying magnetic flux. formed powerful then detaches its base, and propagates as discrete ejection. outflow produces relativistic plasma that fills surroundings hole, contributing formation low-density cavity. While pressure cavity is equilibrium with surrounding interstellar medium (ISM), inertia orders magnitude lower than ISM. This implies cannot efficiently decelerate ejecta, most observations. modest deceleration within cavities observed some cases can be presence clouds and/or filaments, forming wide transition zone between