A Magnetic Bomb Scenario for Relativistic Jet Events in the Microquasar GRS 1915+105

TL;DR

This paper proposes a magnetic bomb scenario based on the suspended accretion model to explain the multiwavelength behavior of relativistic jet events in GRS 1915+105, linking magnetic instabilities to observed X-ray and radio features.

Contribution

It introduces a novel magnetic bomb model that connects magnetic dynamo activity to jet ejections in microquasars, providing a unified explanation for observed multiwavelength phenomena.

Findings

The scenario reproduces the timing and spectral features of X-ray dips and spikes.

It links magnetic energy release to jet formation in black hole systems.

Correlated infrared and radio emissions support the magnetic bomb mechanism.

Abstract

We present a magnetic bomb scenario for the multiwavelength behavior during "Type B" relativistic jet events in the microquasar GRS 1915+105. These events are characterized by a hard X-ray dip which terminates in a soft X-ray spike. The scenario, based on the suspended accretion model for long gamma-ray bursts, posits a magnetic dynamo around an accreting Kerr black hole which reaches the Van Putten-Levinson critical value of poloidal magnetic field energy-to-kinetic energy (E_B/E_k ~= 1/15) in the inner accretion disk. The toroidal inner accretion disk subsequently becomes unstable, and the poloidal magnetic field energy in the inner torus magnetosphere is promptly released as it disconnects from the black hole -- the magnetic bomb (``B-bomb'') explosion. This scenario matches the long-duration time-scale and spectral evolution of the hard X-ray dip, and the short-duration time-scale and energetics of the soft X-ray spike of type B events, as well as correlated features in the infrared and radio wavebands. We discuss some implications of these results for understanding the formation of relativistic jets in black hole systems.