Modeling Spectral Variability of Prompt GRB Emission within the Jitter Radiation Paradigm
arXiv:0902.4244 · doi:10.1088/0004-637X/702/1/L91
Abstract
The origin of rapid spectral variability and certain spectral correlations of the prompt gamma-ray burst emission remains an intriguing question. The recently proposed theoretical model of the prompt emission is build upon unique spectral properties of jitter radiation -- the radiation from small-scale magnetic fields generated at a site of strong energy release (e.g., a relativistic collisionless shock in baryonic or pair-dominated ejecta, or a reconnection site in a magnetically-dominated outflow). Here we present the results of implementation of the model. We show that anisotropy of the jitter radiation pattern and relativistic shell kinematics altogether produce effects commonly observed in time-resolved spectra of the prompt emission, e.g., the softening of the spectrum below the peak energy within individual pulses in the prompt light-curve, the so-called "tracking" behavior (correlation of the observed flux with other spectral parameters), the emergence of hard, synchrotron-violating spectra at the beginning of individual spikes. Several observational predictions of the model are discussed.
arXiv commentApJL, in press
References in corpus (27)
- Generation of Magnetic Fields in the Relativistic Shock of Gamma-Ray-Burst Sources
- The BATSE Gamma-Ray Burst Spectral Catalog. I. High Time Resolution Spectroscopy of Bright Bursts using High Energy Resolution Data
- Afterglow Emission from Naked Gamma-Ray Bursts
- The Complete Spectral Catalog of Bright BATSE Gamma-Ray Bursts
- Interpenetrating plasma shells: near-equipartition magnetic field generation and non-thermal particle acceleration
- The Synchrotron Shock Model Confronts a `Line of Death' in the BATSE Gamma-Ray Burst Data
- On the structure of relativistic collisionless shocks in electron-ion plasmas
- Images and Spectra From the Interior of a Relativistic Fireball
- Theory of "Jitter" Radiation from Small-Scale Random Magnetic Fields and Prompt Emission from Gamma-Ray Burst Shocks
- Magnetic Field Generation in Collisionless Shocks; Pattern Growth and Transport
- Long Term Evolution of Magnetic Turbulence in Relativistic Collisionless Shocks: Electron-Positron Plasmas
- Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts
- Prompt and delayed emission properties of Gamma-Ray Bursts observed with BeppoSAX
- Magnetic field evolution in relativistic unmagnetized collisionless shocks
- X-ray Flashes from Off-axis Gamma-Ray Bursts
- Particle Acceleration and Magnetic Field Generation in Electron-Positron Relativistic Shocks
- The theory of spectral evolution of the GRB prompt emission
- Gamma-Ray Burst Spectra and Light Curves as Signatures of a Relativistically Expanding Plasma
- Radio Detection of Old GRB Remnants in the Local Universe
- Constraints on Off-Axis X-Ray Emission from Beamed GRBs
- Realistic analytic model for the prompt and high latitude emission in GRBs
- Diffusive Synchrotron Radiation from Relativistic Shocks of Gamma-Ray Burst Sources
- Development of a Turbulent Outflow During Electron-Positron Magnetic Reconnection
- The role of the Weibel instability at the reconnection jet front in relativistic pair plasma reconnection
- Radiative cooling in relativistic collisionless shocks. Can simulations and experiments probe relevant GRB physics?
- Microlensing of collimated Gamma-Ray Burst afterglows
- Angular Dependence of Jitter Radiation Spectra from Small-Scale Magnetic Turbulence
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- Time-Resolved Spectroscopy of the 3 Brightest and Hardest Short Gamma-Ray Bursts Observed with the FGST Gamma-Ray Burst Monitor
- Radiation from sub-Larmor scale magnetic fields
- Gamma-Ray Burst Pulse Shapes: Evidence for Embedded Shock Signatures?
- Gamma-ray burst spectra and spectral correlations from sub-photospheric Comptonization
- Gamma-ray Burst Prompt Emission: Jitter Radiation in Stochastic Magnetic Field Revisited
- A Novel Emission Spectrum From A Relativistic Electron Moving In A Random Magnetic Field
- Radiative diagnostics for sub-Larmor scale magnetic turbulence
- On Particle Transport and Radiation Production in Sub-Larmor-Scale Electromagnetic Turbulence
- Angular Dependence of Jitter Radiation Spectra from Small-Scale Magnetic Turbulence
- Peculiarly Narrow SED of GRB 090926B with MAXI and Fermi/GBM
- Radiation From Particles Moving in Small-Scale Magnetic Fields Created in Solid-Density Laser-Plasma Laboratory Experiments
- (Quasi-)collisional Magneto-optic Effects in Collisionless Plasmas with sub-Larmor-scale Electromagnetic Fluctuations
- Jitter radiation: towards TeV-photons of gamma-ray bursts
- On the Quasicollisionality of Plasmas with Small-Scale Electric Turbulence
- GRB variabilities and following gravitational waves induced by gravitational instability in NDAFs