Pair loading in Gamma-Ray Burst Fireball And Prompt Emission From Pair-Rich Reverse Shock
arXiv:astro-ph/0308452 · doi:10.1086/379231
Abstract
Gamma-ray bursts (GRBs) are believed to originate from ultra-relativistic winds/fireballs to avoid the "compactness problem". However, the most energetic photons in GRBs may still suffer from absorption leading to electron/positron pair production in the winds/fireballs. We show here that in a wide range of model parameters, the resulting pairs may dominate those electrons associated with baryons. Later on, the pairs would be carried into a reverse shock so that a shocked pair-rich fireball may produce a strong flash at lower frequencies, i.e. in the IR band, in contrast with optical/UV emission from a pair-poor fireball. The IR emission would show a 5/2 spectral index due to strong self-absorption. Rapid responses to GRB triggers in the IR band would detect such strong flashes. The future detections of many IR flashes will infer that the rarity of prompt optical/UV emissions is in fact due to dust obscuration in the star formation regions.
8 pages, 2 figures, ApJ accepted
References in corpus (44)
- Collapsars - Gamma-Ray Bursts and Explosions in "Failed Supernovae"
- Gamma-Ray Bursts and the Fireball Model
- Optical and Long Wavelength Afterglow from Gamma-Ray Bursts
- Are Gamma-Ray Bursts in Star Forming Regions?
- Theories of Gamma-Ray Bursts
- The Observed Offset Distribution of Gamma-Ray Bursts from Their Host Galaxies: A Robust Clue to the Nature of the Progenitors
- The BATSE Gamma-Ray Burst Spectral Catalog. I. High Time Resolution Spectroscopy of Bright Bursts using High Energy Resolution Data
- Observation of contemporaneous optical radiation from a gamma-ray burst
- Predictions for The Very Early Afterglow and The Optical Flash
- Lower Limits on Lorentz Factors in Gamma Ray Bursts
- Polarization of the prompt gamma-ray emission from the gamma-ray burst of 6 December 2002
- GRB990123, The Optical Flash and The Fireball Model
- Light Curves of GRB Optical Flashes
- Dust sublimation by GRBs and its implications
- GRB 990123: Reverse and Internal Shock Flashes and Late Afterglow
- An analysis of gamma-ray burst spectral break models
- Spectral Properties of Blast Wave Models of Gamma-Ray Burst Sources
- X-ray Rich GRB, Photospheres and Variability
- X-ray Destruction of Dust Along the Line of Sight to Gamma-Ray Bursts
- Pulse Width Evolution in GRBs: Evidence for Internal Shocks
- Efficiency and spectrum of internal gamma-ray burst shocks
- Physical parameters and emission mechanism in Gamma-Ray Bursts
- Gamma-Ray Burst in a Molecular Cloud: Destruction of Dust and H2, and Emergent Spectrum
- Emission Spectra from Internal Shocks in Gamma-Ray-Burst Sources
- Radiation Front Sweeping the Ambient Medium of Gamma-Ray Bursts
- The Fading Optical Counterpart of GRB~970228, Six Months and One Year Later
- SupraNova Events from Spun-up Neutron Stars: an Explosion in Search of an Observation
- Relativistic Winds from Compact Gamma-Ray Sources: II. Pair Loading and Radiative Acceleration in Gamma-ray Bursts
- The Host Galaxy of GRB 990123
- Constraints on the bulk Lorentz factor in the internal shock scenario for gamma-ray bursts
- Radiative Regimes in Gamma-Ray Bursts and Afterglows
- Extinction of gamma-ray burst afterglows as a diagnostic of the location of cosmic star formation
- Electron-Positron Pair Cascades and Precursors in Gamma-Ray Bursts
- Precursors and electron-positron pair loading from erupting fireballs
- Luminosity and Variability of Collimated Gamma-ray Bursts
- Prompt Optical Observations of Gamma-ray Bursts
- Relativistic Winds from Compact Gamma-ray Sources: I. Radiative Acceleration in the Klein-Nishina Regime
- The Broadband Afterglow of GRB980329
- Gamma-Ray Bursts: Afterglows and Central Engines
- A Search for Early Optical Emission from Short and Long Duration Gamma-ray Bursts
- Was GRB 990123 a unique optical flash?
- Flash-Heating of Circumstellar Clouds by Gamma Ray Bursts
- Compton Echoes from Gamma-ray Bursts
- Identifying Gamma-Ray Burst Remnants Through Positron Annihilation Radiation
Cited by in corpus (16)
- Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
- Gamma-Ray Bursts in the Swift Era
- Gamma-ray burst early afterglows: reverse shock emission from an arbitrarily magnetized ejecta
- The very early afterglow powered by the ultra-relativistic mildly magnetized outflows
- Unstable GRB photospheres and electron-positron annihilation lines
- Reverse Shock Emission as a Probe of GRB Ejecta
- Prompt optical emission from residual collisions in GRB outflows
- Gamma-ray burst afterglows
- Early optical afterglow lightcurves of neutron-fed Gamma-ray bursts
- Prompt Ultraviolet-to-Soft-X-Ray Emission of Gamma-Ray Bursts: Application to GRB 031203?
- Reverse Shock Emission in Gamma-ray Bursts Revisited
- Particle Acceleration, Magnetic Field Generation, and Associated Emission in Collisionless Relativistic Jets
- UV/Optical Emission Accompanying Gamma-ray Burst
- Prediction on the very early Afterglow of X-ray Flashes
- Time lag between prompt optical emission and gamma-rays in GRBs
- Smoking Supernovae