A magnetic model for low/hard state of black hole binaries

TL;DR

This paper proposes a magnetic model for the low/hard state of black hole X-ray binaries, explaining spectral profiles and jet formation through magnetic field transportation and accretion flow dynamics.

Contribution

It introduces a novel magnetic model linking accretion disk structure, spectral states, and jet formation in black hole binaries.

Findings

Spectral profiles fit observed data at multiple dates.

Steep radio/X-ray correlations explained by the model.

Jet formation linked to magnetic field transportation.

Abstract

A magnetic model for low/hard state (LHS) of black hole X-ray binaries (BHXBs),H1743-322 and GX 339-4, is proposed based on the transportation of magnetic field from a companion into an accretion disk around a black hole (BH). This model consists of a truncated thin disk with an inner advection-dominated accretion flow (ADAF). The spectral profiles of the sources are fitted in agreement with the data observed at four different dates corresponding to the rising phase of the LHS. In addition, the association of the LHS with quasi-steady jet is modelled based on transportation of magnetic field, where the Blandford-Znajek (BZ) and Blandford-Payne (BP) processes are invoked to drive the jets from BH and inner ADAF. It turns out that the steep radio/X-ray correlations observed in H1743-322 and GX 339-4 can be interpreted based on our model.