st ro - p h / 01 11 45 4 v 1 2 3 N ov 2 00 1 Hydrodynamics of Relativistic Blast Waves in a Density - Jump Medium and Their Emission Signature
نویسندگان
چکیده
We analyze in detail the hydrodynamics and afterglow emission of an ultrarelativistic blast wave when it expands in a density-jump medium. Such a medium is likely to appear in the vicinity of gamma-ray bursts (GRBs) associated with massive stars. The interaction of the blast wave with this medium is described through a reverse shock and a forward shock. We show that the reverse shock is initially relativistic if the factor of a density jump (α) is much larger than 21, and Newtonian if 1 < α ≪ 21. We also calculate light curves of the afterglow emission during the interaction and find that the optical flux density initially decays abruptly, then rises rapidly, and finally fades down based on a power-law, which could be followed by an abrupt decay when the reverse shock has just crossed the originally swept-up matter. Therefore, one property of an afterglow occurring in a density-jump medium is an abrupt drop followed by a bump in the light curve and thus provides a probing of circumburst environments. In addition, this property could not only account for the optical afterglows of GRB 970508 and GRB 000301C but also explain the X-ray afterglow of GRB 981226.
منابع مشابه
ar X iv : a st ro - p h / 01 11 45 4 v 2 2 6 N ov 2 00 1 Hydrodynamics of Relativistic Blast Waves in a Density - Jump Medium and Their Emission Signature
We analyze in detail the hydrodynamics and afterglow emission of an ultrarelativistic blast wave when it expands in a density-jump medium. Such a medium is likely to appear in the vicinity of gamma-ray bursts (GRBs) associated with massive stars. The interaction of the blast wave with this medium is described through a reverse shock and a forward shock. We show that the reverse shock is initial...
متن کاملar X iv : a st ro - p h / 06 03 12 0 v 1 6 M ar 2 00 6 Self - similar solutions for the interaction of relativistic ejecta with an ambient medium
We find self-similar solutions to describe the interaction of spherically symmetric ejecta expanding at relativistic speeds with an ambient medium having a power law density distribution. Using this solution, the time evolution of the Lorentz factor of the outer shock is derived as a function of the explosion energy, the mass of the ejecta, and parameters for the ambient medium. These solutions...
متن کاملHydrodynamics of Relativistic Blast Waves in a Density-jump Medium and Their Emission Signature
We analyze in detail the hydrodynamics and afterglow emission of an ultrarelativistic blast wave when it expands in a density-jump medium. Such a medium is likely to appear in the vicinity of gamma-ray bursts (GRBs) associated with massive stars. The interaction of the blast wave with this medium is described through a reverse shock and a forward shock. We show that the reverse shock is initial...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001