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Statistical study of magnetic reconnection in accretion disks systems around HMXBs

Published online by Cambridge University Press:  30 December 2019

Luís H.S. Kadowaki ,
Elisabete M. de Gouveia Dal Pino  and
James M. Stone
Luís H.S. Kadowaki
Affiliation:
Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas 1226 Matão Street São Paulo, 05508-090, Brasil email: [email protected]
Elisabete M. de Gouveia Dal Pino
Affiliation:
Universidade de São Paulo, Instituto de Astronomia, Geofísica e Ciências Atmosféricas 1226 Matão Street São Paulo, 05508-090, Brasil email: [email protected]
James M. Stone
Affiliation:
Department of Astrophysical Sciences, Peyton Hall, Princeton University Princeton, NJ 08544, USA
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Abstract

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Highly magnetized accretion disks are present in high-mass X-ray binaries (HMXBs). A potential mechanism to explain the transition between the High/Soft and Low/Hard states observed in HMXBs can be attributed to fast magnetic reconnection induced in the turbulent corona. In this work, we present results of global general relativistic MHD (GRMHD) simulations of accretion disks around black holes that show that fast reconnection events can naturally arise in the coronal region of these systems in presence of turbulence triggered by MHD instabilities, indicating that such events can be a potential mechanism to explain the transient non-thermal emission in HMXBs. To find the zones of fast reconnection, we have employed an algorithm to identify the presence of current sheets in the turbulent regions and computed statistically the magnetic reconnection rates in these locations obtaining average reconnection rates consistent with the predictions of the theory of turbulence-induced fast reconnection.

Keywords

accretion disksmagnetohydrodynamics (MHD)instabilitiesturbulencemagnetic reconnection
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 273 - 276
Copyright
© International Astronomical Union 2019 

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