Volume 101, Number 1, January 2013
|Number of page(s)||6|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||23 January 2013|
Squeezing of toroidal accretion disks
1 School of Mathematical Sciences, Queen Mary University of London - Mile End Road, London E1 4NS, UK, EU
2 ENEA - C.R, UTFUS-MAG - Via Enrico Fermi 45, I-00044 Frascati, Roma, Italy, EU
3 Dipartimento di Fisica, Università di Roma “Sapienza” - Piazzale Aldo Moro 5, I-00185 Roma, Italy, EU
Received: 17 October 2012
Accepted: 10 December 2012
Accretion disks around very compact objects such as very massive black holes can grow according to thick toroidal models. We face the problem of defining how the thickness of a toroidal accretion disk spinning around a Schwarzschild black hole changes under the influence of a toroidal magnetic field and by varying the fluid angular momentum. We consider both a hydrodynamic and a magnetohydrodynamic disk based on the Polish doughnut thick model. We show that the torus thickness remains basically unaffected but tends to increase or decrease slightly depending on the balance of the magnetic, gravitational and centrifugal effects which the disk is subjected to.
PACS: 97.10.Gz – Accretion and accretion disks / 95.30.Qd – Magnetohydrodynamics and plasmas
© EPLA, 2013
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