A numerical approach for radiative cooling in relativistic outflows

Abstract

In high energy astrophysics scenarios such as blazars, GRBs or PWNe, it is highly probable that ultra-relativistic particles interact with photons in their environment through scattering. As long as the energy of the particle is greater than the energy of the interacting photon, the (classical) scattering is known to be in the Thomson regime. Otherwise, quantum effects will affect the scattering cross section, and we enter into the so-called Klein-Nishina regime. It is well known that radiative cooling in the Thomson regime is very efficient, leading to soft high-energy spectra. However, observations have shown that, in many cases, the high energy spectrum of some objects is rather hard. This has led to think that maybe particles are not being cooled down efficiently. Asymptotic approximations of the Klein-Nishina regime have been formulated in the last decades in order to account for these corrections in the distribution of particles responsible for the observed spectrum of high energy sources. In this work we presenta a numerical approach of the Klein-Nishina corrections to the radiative cooling. It has been developed to simulate the evolution of a distribution of particles interacting with photons in their surroundings via inverse Compton scattering.

arXiv comment6 pages, 5 figures, contribution to the 9th International Workshop on Astronomy and Relativistic Astrophysics (IWARA2020 Video Conference) conference's proceedings, accepted for publication in Astronomische Nachrichten

References in corpus (11)

• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• Radio Transients from Gamma-Ray Bursters
• Spectral Properties of Blast Wave Models of Gamma-Ray Burst Sources
• Observation of inverse Compton emission from a long $\gamma$-ray burst
• Klein-Nishina Effects in the Spectra of Non-Thermal Sources Immersed in External Radiation Fields
• Klein-Nishina Effects on Optically Thin Synchrotron and Synchrotron Self-Compton Spectrum
• Inverse Compton Signatures of Gamma-Ray Burst Afterglows
• On the multiwavelength emission from Gamma Ray Burst afterglows
• Inverse Compton cooling in Klein-Nishina regime and GRB prompt spectrum
• Adiabatic and Radiative Cooling of Relativistic Electrons Applied to Synchrotron Spectra and Light-Curves of Gamma-Ray Burst Pulses

Cited by in corpus (2)

• GRMHD simulations of neutron-star mergers with weak interactions: r-process nucleosynthesis and electromagnetic signatures of dynamical ejecta
• Balancing Turbulent Heating with Radiative Cooling in Blazars