Publication date: Apr 2013
Results of our recent studies suggest a possibility of existence of halo (off-equatorial) electrically charged toroidal structures (thick discs) and polar caps circling in axially symmetric backgrounds of central objects (compact stars, black holes, etc.) endowed with electromagnetic fields. Along with the existence of the halo structures we have also found equatorial tori with cusps enabling outflows of matter from the torus, without the presence of strong gravity, i.e., also in the Newtonian regime. These phenomena represent qualitatively new consequence of the interplay between gravity and electromagnetism, and can provide an insight into processes determining vertical structure of dusty tori surrounding accretion discs. Some of these results are summarized also in the paper accepted for the publication in The Astrophysical Journal Supplement, scheduled for the March 2013, Volume 205.
Kovar, Jiri; Slany, P.; Karas, V.; Stuchlik, Z.;