Jul 12 – 23, 2021
Online
Europe/Berlin timezone

A theoretical model of an off-axis GRB jet

Jul 14, 2021, 6:00 PM
1h 30m
04

04

Talk GAD | Gamma Ray Direct Discussion

Speaker

Mr Boris Betancourt Kamenetskaia

Description

In light of the most recent observations of late afterglows produced by the merger of compact objects or by the core-collapse of massive dying stars, we research the evolution of the afterglow produced by an off-axis top-hat jet and its interaction with a surrounding medium. The medium is parametrized by a power law distribution of the form $n(r)\propto r^{-k}$, where $k$ is the stratification parameter and contains the development when the surrounding density is constant ($k=0$) or wind-like (k=2). We develop an analytical synchrotron forward-shock model when the outflow is viewed off-axis, and it is decelerated by a stratified medium. Using the X-ray data points collected by a large campaign of orbiting satellites and ground telescopes, we have managed to apply our model and fit the X-ray spectrum of the GRB afterglow associated to SN 2020bvc with conventional parameters. Our model predicts that its circumburst medium is parametrized by a power law with stratification parameter $k=1.5$.

Keywords

mergers; black holes; neutron stars; compact binary stars; radiation mechanism; nonthermal; ISM; GRB

Subcategory Theoretical Methods

Primary authors

Mr Boris Betancourt Kamenetskaia Nissim Fraija (Astronomy Institute) Dr Maria Giovanna Dainotti Mr Antonio Gálvan-Gámez (Instituto de Astronomía, Universidad Nacional Autónoma de México) Dr Rodolfo Barniol Duran (Department of Physics and Astronomy, California State University, Sacramento) Simone Dichiara (Universidad Nacional Autónoma de México)

Presentation materials