Emission from Bow Shocks of Beamed Gamma-Ray Bursts
نویسندگان
چکیده
Beamed γ-ray burst (GRB) sources produce a bow shock in their gaseous environment. The emitted flux from this bow shock may dominate over the direct emission from the jet for lines of sight which are outside the angular radius of the jet emission, Θb. The event rate for these lines of sight is increased by a factor of ∼ 260(Θb/5◦)−2. For typical GRB parameters, we find that the bow shock emission from a jet of half-angle ∼ 5◦ is visible out to tens of Mpc in the radio and hundreds of Mpc in the X-rays. If GRBs are linked to supernovae, studies of peculiar supernovae in the local universe should reveal this non-thermal bow shock emission for weeks to months following the explosion. Subject headings: gamma ray bursts
منابع مشابه
On the energy of neutrinos from gamma ray bursts
Ultra high energy protons accelerated at the shocks causing gamma ray bursts photoproduce pions, and then neutrinos in situ. I consider here the sources of losses in this process, namely adiabatic and synchrotron losses by both pions and muons. When the shocks under consideration are external, i.e., those between the ejecta and the surrounding interstellar medium, I show that neutrinos produced...
متن کاملOff-axis Emission from the Beamed Afterglow of Gamma Ray Bursts and a Possible Interpretation of Slowly Declining X-Ray Afterglow of GRB980425
A formula for off-axis emissions from the beamed afterglow of GRBs in a synchrotron model is derived. The formula is applied to an inhomogeneous circumstellar matter obeying n ∝ r−2 suggested for SN1998bw/GRB980425. The slow decline rate as well as the X-ray flux similar to the observed values are obtained for appropriate choice of the parameters so that the association of GRB980425 with SN1998...
متن کاملGamma-Ray Bursts - When Theory Meets Observations
Gamma-Ray Bursts (GRBs) are the brightest objects observed. They are also the most relativistic objects known so far. GRBs occur when an ultrarelativisitic ejecta is slowed down by internal shocks within the flow. Relativistic particles accelerated within these shocks emit the observed gamma-rays by a combination of synchrotron and inverse Compton emission. External shocks with the circumstella...
متن کاملCooling of Accelerated Nucleons and Neutrino Emission in Gamma-Ray Bursts
Using Monte Carlo simulations, we demonstrate photopion production from Fermi-accelerated protons and the resulting neutrino production in gamma-ray bursts. Unless internal shocks occur at quite large distance from the center, ultra high-energy protons are depleted by photopion production and synchrotron radiation. Internal shocks at fiducial distance cause neutrino bursts, which accompany gamm...
متن کاملConstraints on Off-Axis X-Ray Emission from Beamed GRBs
We calculate the prompt x–ray emission as a function of viewing angle for beamed Gamma–Ray Burst (GRB) sources. Prompt x-rays are inevitable due to the less highly blueshifted photons emitted at angles ∼> 1/γ relative to the beam symmetry axis, where γ is the expansion Lorentz factor. The observed flux depends on the combinations γ∆θ and γθv, where ∆θ is the beaming angle and θv is the viewing ...
متن کامل