Collimated outflows (jets) are ubiquitous in the universe, appearing around sources as diverse as protostars and extragalactic supermassive black holes. Jets are thought to be magnetically collimated, and launched from a magnetized accretion disk surrounding a compact gravitating object. We have developed the first laboratory experiment to address time-dependent, episodic phenomena relevant to the poorly understood jet acceleration and collimation region (Ciardi at al., 2009). The experiments were performed on the MAGPIE pulsed power facility (1.5 MA, 250 as) at Imperial College. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. The results provide a unique view of the possible transition from a relatively steady-state jet launching to the observed highly structured outflows.
Laboratory simulations of astrophysical jets / Lebedev, Sergey V; Suzuki Vidal, Francisco; Ciardi, Andrea; Bocchi, Matteo; Bland, Simon N.; Burdiak, Guy; Chittenden, Jerry P.; De Grouchy, Phil; Hall, Gareth N.; Harvey Thompson, Adam; Marocchino, Alberto; Swalding, George; Frank, Adam; Blackman, Eric G.; Camenzind, Max. - STAMPA. - 6:(2010), pp. 26-35. (Intervento presentato al convegno 274th Symposium of the International-Astronomical-Union on Advances in Plasma Astrophysics tenutosi a Giardini Naxos, ITALY nel SEP 06-10, 2010) [10.1017/S1743921311006521].
Laboratory simulations of astrophysical jets
MAROCCHINO, ALBERTO;
2010
Abstract
Collimated outflows (jets) are ubiquitous in the universe, appearing around sources as diverse as protostars and extragalactic supermassive black holes. Jets are thought to be magnetically collimated, and launched from a magnetized accretion disk surrounding a compact gravitating object. We have developed the first laboratory experiment to address time-dependent, episodic phenomena relevant to the poorly understood jet acceleration and collimation region (Ciardi at al., 2009). The experiments were performed on the MAGPIE pulsed power facility (1.5 MA, 250 as) at Imperial College. The experimental results show the periodic ejections of magnetic bubbles naturally evolving into a heterogeneous jet propagating inside a channel made of self-collimated magnetic cavities. The results provide a unique view of the possible transition from a relatively steady-state jet launching to the observed highly structured outflows.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
