On the TeV spectral energy distribution of HAWC's sources

TL;DR

This paper systematically analyzes the TeV gamma-ray spectra of sources in the HAWC catalog, comparing different spectral models to identify deviations from simple power laws and providing detailed spectral parameters.

Contribution

It introduces a comprehensive spectral analysis of HAWC sources using multiple models and identifies sources with significant spectral deviations from simple power laws.

Findings

Three sources deviate from simple power law spectra with high significance.

Comparison of spectral models to determine the best fit for each source.

Spectral parameters are provided for sources with deviations.

Abstract

We present a systematic study of the TeV gamma-ray spectrum for the sources in the 2HWC HAWC catalog. Three spectrum models are considered in the analysis: simple power law, power law with exponential cut-off and a log-parabola. A comparison of the test statistic of nested models was performed in order to look for the best description. We used gamma-ray sky maps of 17 and 25 months of HAWC data. From the analysis, only three sources of the catalog deviate from simple power law spectrum with high significance. The corresponding parameters are given in each case.