The TeV gamma-ray luminosity of the Milky-Way and the contribution of H.E.S.S. unresolved sources to VHE diffuse emission

Abstract

H.E.S.S. has recently completed a systematic survey of the Galactic plane in the TeV energy domain. We analyze the flux, latitude and longitude distributions of $\gamma -$ray sources observed by H.E.S.S. in order to infer the properties of Galactic TeV source population. We show that the total Milky-Way luminosity in the 1-100 TeV energy range is $L_{\mathrm{MW}}=1.7_{-0.4}^{+0.5}\times 10^{37}\mathrm{ergs}{\sec }^{-1}$. Evaluating the cumulative flux expected at Earth by the considered population, we show that H.E.S.S. unresolved sources provide a relevant contribution to the diffuse Galactic emission. Finally, in the hypothesis that the majority of bright sources detected by H.E.S.S. are powered by pulsar activity, like e.g. Pulsar Wind Nebulae or TeV halos, we estimate the main properties of the pulsar population.

11 pages, 5 figures

References in corpus (10)

• Neutron Star Observations: Prognosis for Equation of State Constraints
• The Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
• The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• Milagro Observations of Multi-TeV Emission from Galactic Sources in the Fermi Bright Source List
• Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
• Contribution of pulsars to cosmic-ray positrons in light of recent observation of inverse-Compton halos
• Source population synthesis and the Galactic diffuse gamma-ray emission
• Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission

Cited by in corpus (14)

• Unresolved sources naturally contribute to PeV $\gamma$-ray diffuse emission observed by Tibet AS$\gamma$
• Insights from LHAASO and IceCube into the origin of the Galactic diffuse TeV--PeV emission
• Decomposing the Origin of TeV-PeV Emission from the Galactic Plane: Implications of Multi-messenger Observations
• The contribution of Galactic TeV pulsar wind nebulae to Fermi-LAT diffuse emission
• Galactic Diffuse Neutrino Emission from Sources beyond the Discovery Horizon
• The Steady-State Multi-TeV Diffuse Gamma-Ray Emission Predicted with GALPROP and Prospects for the Cherenkov Telescope Array
• Unveiling the nature of galactic TeV sources with IceCube results
• Setting an upper limit for the total TeV neutrino flux from the disk of our Galaxy
• LHAASO protons versus LHAASO diffuse gamma-rays: a consistency check
• The Origin of the Very-High-Energy Diffuse $\gamma$-Ray Emission: The Case for Galactic Source Cocoons
• HAWC Study of Very-High-Energy $\gamma$-ray Spectrum of HAWC J1844-034
• Could the TeV emission of starburst galaxies originate from pulsar wind nebulae?
• First constraints on axion-like particles from Galactic sub-PeV gamma rays
• Interpreting the LHAASO Galactic diffuse emission data