Synchrotron emission in GRBs observed by Fermi: Its limitations and the role of the photosphere

TL;DR

This study analyzes Fermi GRB spectra, highlighting limitations of synchrotron emission models, the importance of photospheric components, and the implications for jet properties and dissipation mechanisms.

Contribution

It provides a detailed examination of synchrotron emission in GRBs, revealing challenges to existing models and suggesting the need for alternative interpretations.

Findings

Bulk Lorentz factor decreases over pulses, between 1000 and 100.

Data reject fast-cooled synchrotron spectrum, implying high electron Lorentz factors.

Synchrotron model limitations highlight the need for alternative explanations.

Abstract

It has been suggested that the prompt emission in gamma-ray bursts consists of several components giving rise to the observed spectral shape. Here we examine a sample of the 8 brightest, single pulsed {\it Fermi} bursts whose spectra are modelled by using synchrotron emission as one of the components. Five of these bursts require an additional photospheric component (blackbody). In particular, we investigate the inferred properties of the jet and the physical requirements set by the observed components for these five bursts, in the context of a baryonic dominated outflow, motivated by the strong photospheric component. We find similar jet properties for all five bursts: the bulk Lorentz factor decreases monotonously over the pulses and lies between 1000 and 100. This evolution is robust and can neither be explained by a varying radiative efficiency nor a varying magnetisation of the jet assuming the photosphere radius is above the coasting radius. Such a behaviour challenges several dissipation mechanisms, e.g., the internal shocks. Furthermore, in all 8 cases the data clearly reject a fast-cooled synchrotron spectrum (in which a significant fraction of the emitting electrons have cooled to energies below the minimum injection energy), inferring a typical electron Lorentz factor of $10^4 - 10^7$. Such values are much higher than what is typically expected in internal shocks. Therefore, while the synchrotron scenario is not rejected by the data, the interpretation does present several limitations that need to be addressed. Finally, we point out and discuss alternative interpretations.