A search for VHE counterparts of galactic Fermi sources

TL;DR

This study conducts a comprehensive search for very high-energy gamma-ray counterparts to Galactic Fermi/LAT bright sources, revealing a correlation between GeV and TeV emissions that enhances understanding of cosmic accelerators.

Contribution

It presents the first extensive analysis linking Fermi/LAT bright sources with VHE gamma-ray counterparts, improving source association accuracy.

Findings

LAT bright sources are correlated with TeV sources

Improved angular resolution reduces source confusion

GeV to TeV spectra show significant correlations

Abstract

Very high-energy (VHE; E > 100 GeV) gamma-rays have been detected from a wide range of astronomical objects, such as SNRs, pulsars and pulsar wind nebulae, AGN, gamma-ray binaries, molecular clouds, and possibly star-forming regions as well. At lower energies, sources detected using Large Area Telescope (LAT) aboard Fermi provide a rich set of data which can be used to study the behavior of cosmic accelerators in the GeV to TeV energy bands. In particular, the improved angular resolution in both bands compared to previous instruments significantly reduces source confusion and facilitates the identification of associated counterparts at lower energies. In this talk, a comprehensive search for VHE gamma-ray sources which are spatially coincident with Galactic Fermi/LAT bright sources is performed, and the GeV to TeV spectra of selected coincident sources are shown. It is found that LAT bright GeV sources are correlated to TeV sources, in contrast with previous studies using EGRET data.