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• W3100106251 endingPage "L9" @default.
• W3100106251 startingPage "L9" @default.
• W3100106251 abstract "We present a model for relativistic jets which generates a particular angular distribution of Lorentz factor and energy per solid angle. We consider a fireball with specific internal energy E/M launched with bulk Lorentz factor gamma_B. This boosted fireball model is motivated by the phenomenology of collapsar jets, but is applicable to a wide variety of relativistic flows. In its center-of-momentum frame the fireball expands isotropically, converting its internal energy into radially expanding flow with asymptotic Lorentz factor eta_0 ~ E/M. In the lab frame the flow is beamed, expanding with Lorentz factor Gamma = 2 eta_0 gamma_B in the direction of its initial bulk motion and with characteristic opening angle theta_0 ~ 1/gamma_B. The flow is jet-like with Gamma theta_0 ~ 2 eta_0 such that jets with Gamma > 1/theta_0 are naturally produced. The choice eta_0 ~ gamma_B ~ 10 yields a jet with Gamma ~ 200 on-axis and angular structure characterized by opening angle theta_0 ~ 0.1 of relevance for cosmological GRBs, while gamma_B >~ 1 may be relevant for low-luminosity GRBs. The model produces a family of outflows, of relevance for different relativistic phenomena with structures completely determined by eta_0 and gamma_B. We calculate the energy per unit solid angle for the model and use it to compute light curves for comparison with the widely used top-hat model. The jet break in the boosted fireball light curve is greatly subdued when compared to the top-hat model because the edge of the jet is smoother than for a top-hat. This may explain missing jet breaks in afterglow light curves." @default.
• W3100106251 created "2020-11-23" @default.
• W3100106251 creator A5055500597 @default.
• W3100106251 creator A5064015775 @default.
• W3100106251 date "2013-09-25" @default.
• W3100106251 modified "2023-10-16" @default.
• W3100106251 title "A “BOOSTED FIREBALL” MODEL FOR STRUCTURED RELATIVISTIC JETS" @default.
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• W3100106251 doi "https://doi.org/10.1088/2041-8205/776/1/l9" @default.
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