The HESS Galactic Plane Survey (HGPS), published in 2018, presented a decade of very-high-energy (VHE) gamma-ray observations along the Galactic plane. This study was accompanied by the release of several maps in FITS format, offering a detailed view of the region. The flux upper-limits from these HGPS maps can be compared to the high-energy (HE) spectra of sources catalogued by the Fermi-LAT in the same region. For some sources, extrapolating the Fermi-LAT flux into the VHE range predicts flux values exceeding the upper-limits set by HESS. In this work, we present the results of this comparison and highlight the sources that are of particular interest for future VHE observations.
@article{arxiv.2512.16009,
title = {Exploring the Galactic Plane: A Comparative Study of Fermi-LAT Sources and HESS's Non-Detection at TeV Energies},
author = {François Brun and Baptiste Le Nagat-Neher and Marianne Lemoine-Goumard and Marie-Hélène Grondin and Paul Fauverge},
journal= {arXiv preprint arXiv:2512.16009},
year = {2025}
}
Comments
Presented at the 39th International Cosmic Ray Conference (ICRC 2025)