Exploring the Galactic Plane: A Comparative Study of Fermi-LAT Sources and HESS's Non-Detection at TeV Energies

2025/12/17 by François Brun, Brun, François, Baptiste Le Nagat-Neher +7
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Gamma-ray bursts and supernovae

paper · doi:10.48550/arxiv.2512.16009

Abstract

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.

Citations

• An updated catalogue of 310 Galactic supernova remnants and their statistical properties
• MeerKAT 1.3 GHz Observations of Supernova Remnants
• Fermi-LAT improved Pass~8 event selection

Related

• A search for VHE counterparts of galactic Fermi sources
• Charting the TeV Milky Way: H.E.S.S. Galactic plane survey maps, catalog and source populations
• Detection of new very-high-energy sources outside the galactic plane in the Fermi-LAT data
• TeV Observations of the Galactic Plane with HAWC and Joint Analysis of GeV Data from Fermi
• The H.E.S.S. Galactic Plane Survey - maps, source catalog and source population