2012MNRAS.427.1329L -
Mon. Not. R. Astron. Soc., 427, 1329-1343 (2012/December-1)
Practical flux prescriptions for gamma-ray burst afterglows, from early to late times.
LEVENTIS K., VAN EERTEN H.J., MELIANI Z. and WIJERS R.A.M.J.
Abstract (from CDS):
We present analytic flux prescriptions for broad-band spectra of self-absorbed and optically thin synchrotron radiation from gamma-ray burst afterglows, based on 1D relativistic hydrodynamic simulations. By treating the evolution of critical spectrum parameters as a power-law break between the ultrarelativistic and non-relativistic asymptotic solutions, we generalize the prescriptions to any observer time. Our aim is to provide a set of formulas that constitutes a useful tool for accurate fitting of model parameters to observational data, regardless of the dynamical phase of the outflow. The applicability range is not confined to gamma-ray burst afterglows, but includes all spherical outflows (also jets before the jet-break) that produce synchrotron radiation as they adiabatically decelerate in a cold, power-law medium. We test the accuracy of the prescriptions and show that numerical evidence suggests that typical relative errors in the derivation of physical quantities are about 10per cent. A software implementation of the presented flux prescriptions combined with a fitting code is freely available on request and online.
1 Together they can be used in order to directly fit model parameters to data.
1The URL is
http://www.astro.uva.nl/research/cosmics/gamma-ray-bursts/software/
Abstract Copyright:
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Journal keyword(s):
hydrodynamics - radiation mechanisms: non-thermal - radiative transfer - shock waves - gamma-ray burst: general
Simbad objects:
1
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