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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Magnetic reconnection and Blandford-Znajek process around rotating black holes

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Author(s):
Singh, Chandra B. [1, 2] ; Garofalo, David [3] ; Dal Pino, Elisabete M. de Gouveia [2]
Total Authors: 3
Affiliation:
[1] Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv - Israel
[2] Univ Sao Paulo, Dept Astron IAG USP, Sao Paulo - Brazil
[3] Kennesaw State Univ, Dept Phys, Marietta, GA 30060 - USA
Total Affiliations: 3
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 478, n. 4, p. 5404-5409, AUG 2018.
Web of Science Citations: 1
Abstract

We provide a semi-analytic comparison between the Blandford-Znajek (BZ) and the magnetic reconnection power for accreting black holes in the curved space-time of a rotating black hole. Our main result is that for a realistic range of astrophysical parameters, the reconnection power may compete with the BZ power. The field lines anchored close to or on the black hole usually evolve to open field lines in general relativistic magnetohydrodynamic (GRMHD) simulations. The BZ power is dependent on the black hole spin while magnetic reconnection power is independent of it for the force-free magnetic configuration with open field lines adopted in our theoretical study. This has obvious consequences for the time evolution of such systems particularly in the context of black hole X-ray binary state transitions. Our results provide analytical justification of the results obtained in GRMHD simulations. (AU)

FAPESP's process: 13/10559-5 - Investigation of high energy and plasma astrophysics phenomena: theory, numerical simulations, observations, and instrument development for the Cherenkov Telescope Array (CTA)
Grantee:Elisabete Maria de Gouveia Dal Pino
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/09065-8 - Origin and collimation of compact source jets and acceleration mechanisms
Grantee:Chandra Bahadur Singh
Support type: Scholarships in Brazil - Post-Doctorate