Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-10-23
ApJ 749, 44 (2012)
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
15 pages, 12 figures. Replaced with published version, for which an extra appendix demonstrating scale invariance of the hydro
Scientific paper
We present a powerful new tool for fitting broadband gamma-ray burst afterglow data, which can be used to determine the burst explosion parameters and the synchrotron radiation parameters. By making use of scale invariance between relativistic jets of different energies and different circumburst medium densities, and by capturing the output of high-resolution two-dimensional relativistic hydrodynamical (RHD) jet simulations in a concise summary, the jet dynamics are generated quickly. Our method calculates the full light curves and spectra using linear radiative transfer sufficiently fast to allow for a direct iterative fit of RHD simulations to the data. The fit properly accounts for jet features that so far have not been successfully modeled analytically, such as jet decollimation, inhomogeneity along the shock front and the transitory phase between the early time relativistic and late time non-relativistic outflow. As a first application of the model we simultaneously fit the radio, X-ray and optical data of GRB 990510. We not only find noticeable differences between our findings for the explosion and radiation parameters and those of earlier authors, but also an improved model fit when we include the observer angle in the data fit. The fit method will be made freely available on request and on-line at http://cosmo.nyu.edu/afterglowlibrary. In addition to data fitting, the software tools can also be used to quickly generate a light curve or spectrum for arbitrary observer position, jet and radiation parameters.
der Horst Alexander J. van
MacFadyen Andrew I.
van Eerten Hendrik J.
No associations
LandOfFree
Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-ray burst afterglow broadband fitting based directly on hydrodynamics simulations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-519141