Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Low-energy Electrons in Gamma-Ray Burst Afterglow Models
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Iceland, Iceland.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0003-1800-6382
Number of Authors: 22018 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 859, no 1, article id LllArticle in journal (Refereed) Published
Abstract [en]

Observations of gamma-ray burst (GRB) afterglows have long provided the most detailed information about the origin of this spectacular phenomenon. The model that is most commonly used to extract physical properties of the event from the observations is the relativistic fireball model, where ejected material moving at relativistic speeds creates a shock wave when it interacts with the surrounding medium. Electrons are accelerated in the shock wave, generating the observed synchrotron emission through interactions with the magnetic field in the downstream medium. It is usually assumed that the accelerated electrons follow a simple power-law distribution in energy between specific energy boundaries, and that no electron exists outside these boundaries. This Letter explores the consequences of adding a low-energy power-law segment to the electron distribution with energy that contributes insignificantly to the total energy budget of the distribution. The low-energy electrons have a significant impact on the radio emission, providing synchrotron absorption and emission at these long wavelengths. Shorter wavelengths are affected through the normalization of the distribution. The new model is used to analyze the light curves of GRB 990510, and the resulting parameters are compared to a model without the extra electrons. The quality of the fit and the best-fit parameters are significantly affected by the additional model component. The new component is in one case found to strongly affect the X-ray light curves, showing how changes to the model at radio frequencies can affect light curves at other frequencies through changes in best-fit model parameters.

Place, publisher, year, edition, pages
2018. Vol. 859, no 1, article id Lll
Keywords [en]
gamma-ray burst: general, methods: data analysis, radiation mechanisms: non-thermal
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-157736DOI: 10.3847/2041-8213/aac380ISI: 000432930600002OAI: oai:DiVA.org:su-157736DiVA, id: diva2:1236530
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-02Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Search in DiVA

By author/editor
Jóhannesson, GuđlaugurBjörnsson, Gunnlaugur
By organisation
Nordic Institute for Theoretical Physics (Nordita)
In the same journal
Astrophysical Journal Letters
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf