PoS - Proceedings of Science
Volume 362 - Multifrequency Behaviour of High Energy Cosmic Sources - XIII (MULTIF2019) - Jet Sources & Gamma-Ray Bursts
Multi-messenger signals from short gamma ray bursts
A. Janiuk*, K. Sapountzis, B. James and M. Kolos
Full text: pdf
Pre-published on: November 23, 2020
Published on: December 03, 2020
Abstract
We present the results of simulations done with the code HARM-COOL developed in the CTP PAS Warsaw research group over the years 2017-2019. It is based in the original GR MHD scheme proposed by Gammie et al. (2003) for the simulation of Active Galactic Nucleus, but now it has been suited for the engine of a short Gamma Ray Burst event.
We compute time-dependent evolution of a black hole accretion disk, in two-dimensional, axisymmetric scheme. The code includes neutrino cooling and accounts for nuclear structure of dense, degenerate matter. Free protons, neutrons, and electron-positron
pairs form a neutron-rich, magnetically driven outflow that provides site for subsequent r-process nucleosynthesis.
Here the heavy elements up to the Uranium and Gold are synthesized and may contribute to the chemical enrichment of the circum-burst medium. Their radio-active decay will give signal in lower energies in a timescale of weeks-months after the GRB prompt phase.
In addition, the magnetic fields are responsible for the launching of ultra-relativistic jets along the rotation axis of the central black hole, according to the well-known Blandford-Znajek mechanism. These jets are sites of variable high energy emission in gamma rays. We find that the magnetic field and the black hole spin account for the observed variability timescales and jet energetics.
DOI: https://doi.org/10.22323/1.362.0059
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.