Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279...28i&link_type=abstract
DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 28-31 (2010).
Astronomy and Astrophysics
Astronomy
Photosphere, Gamma-Ray Sources (Astronomical), Astronomical Telescopes, Brightness, Photosphere, Gamma-Ray Sources, Gamma-Ray Bursts, Charge-Coupled Devices, Image Detectors, And Ir Detector Arrays, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification
Scientific paper
Collisionless entrainment of the surrounding matter imports the relativistic baryon component in the Gamma-Ray Burst (GRB) fireball frame. We show that half the fireball energy can be transferred from radiation to the comoving hot motions of baryons under the photosphere. The yet baryon-poor fireball can re-expand to a very high Lorentz factor (VHLF) Γ~103-106 by its own relativistic collisionless pressure beyond the photosphere (so-called collisionless bulk-acceleration), leading to the internal and external shocks. A simple synchrotron emission from the VHLF internal shocks produces (i) the extra power-law spectral component with variability observed in the Fermi GeV bursts, up to the TeV range for the future Cherenkov Telescope Array (CTA), (ii) the GeV onset delay with a weak luminosity dependence tdelay~L-1/5, and (iii) the spectral break of GRB 090926 by the synchrotron cooling break or the maximum synchrotron cutoff limited by the dynamical time, not by the e+/- creation cutoff. The relativistic baryon component could also heat the photospheric thermal photons into the main GRB Band spectrum via pp, pγ (Bethe-Heitler and photomeson) and Coulomb thermalization processes. This hot photosphere-internal-external shock model predicts the anti-correlation of ~TeV neutrinos and GeV γ-rays, which may be detectable by IceCube. The spectral peak and luminosity (Yonetoku) relation is also reproduced if the progenitor stars are nearly identical.
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