ULXs as magnetized sub-Eddington advective accretion flows around stellar mass black holes

Mukhopadhyay, B (2018) ULXs as magnetized sub-Eddington advective accretion flows around stellar mass black holes. In: 15th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, MG 2018, 1-7 July 2018, University of Rome "La Sapienza"Rome; Italy.

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Abstract

Ultra-luminous X-ray sources (ULXs) have been puzzling us with a debate whether they consist of an intermediate mass black hole or super-Eddington accretion by a stellar mass black hole. Here we suggest that in the presence of large scale strong magnetic fields and non-negligible vertical motion, the luminosity of ULXs, particularly in their hard states, can be explained with sub-Eddington accretion by stellar mass black holes. In this framework of 2.5D magnetized advective accretion flows, magnetic tension plays the role of transporting matter (equivalent to viscous shear via turbulent viscosity) and we neither require to invoke an intermediate mass black hole nor super-Eddington accretion. Our model explains the sources, like, NGC 1365 X1/X2, M82 X42.3+59, M99 X1 etc. which are in their hard power-law dominated states. © Relativistic Field Theories, MG 2018. All rights reserved.

Item Type:	Conference Paper
Publication:	15th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, MG 2018
Publisher:	World Scientific Publishing Co. Pte. Ltd.
Additional Information:	cited By 0; Conference of 15th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, MG 2018 ; Conference Date: 1 July 2018 Through 7 July 2018; Conference Code:160314
Keywords:	accretion disks; ULXs; magnetic fields; black holes.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Nov 2020 06:59
Last Modified:	23 Nov 2020 06:59
URI:	http://eprints.iisc.ac.in/id/eprint/66209

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