other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2000ApJ...540..704M - Astrophys. J., 540, 704-714 (2000/September-2)
Theory of ``Jitter'' radiation from small-scale random magnetic fields and prompt emission from gamma-ray burst shocks.
MEDVEDEV M.V.
Abstract (from CDS):
Since large-scale fields may also be present in the ejecta, we construct a two-component, jitter+synchrotron spectral model of the prompt γ-ray emission. Quite surprisingly, this model seems to be readily capable of explaining several properties of time-resolved spectra of some GRBs, such as (1) the violation of the constraint on the low-energy spectral index called the synchrotron ``line of death'', (2) the sharp spectral break at the peak frequency, inconsistent with the broad synchrotron bump, (3) the evidence for two spectral subcomponents, and (4) possible existence of emission features called ``GRB lines.'' We believe these facts strongly support both the existence of small-scale magnetic fields and the proposed radiation mechanism from GRB shocks. As an example, we use the composite model to analyze GRB 910503, which has two spectral peaks. At last, we emphasize that accurate GRB spectra may allow precise determination of fireball properties as early as several minutes after the explosion.
Abstract Copyright: ∼
Journal keyword(s): Gamma Rays: Bursts - Magnetic Fields - Radiation Mechanisms: Nonthermal
Simbad objects: 6
To bookmark this query, right click on this link: simbad:2000ApJ...540..704M and select 'bookmark this link' or equivalent in the popup menu