The Contribution From TeV Halos to the Isotropic Gamma-Ray Background

Abstract

Recent observations have shown that pulsars are surrounded by extended regions which emit TeV-scale gamma rays through the inverse Compton scattering of very high energy electrons and positrons. Such TeV halos are responsible for a large fraction of the Milky Way's TeV-scale gamma-ray emission. In this paper, we calculate the gamma-ray spectrum from the population of TeV halos located within the Andromeda Galaxy, predicting a signal that is expected to be detectable by the Cherenkov Telescope Array (CTA). We also calculate the contribution from TeV halos to the isotropic gamma-ray background (IGRB), finding that these sources should contribute significantly to this flux at the highest measured energies, constituting up to $\sim 20\%$ of the signal observed above $\sim 0.1\mathrm{TeV}$.

9 pages, 3 figures

References in corpus (14)

• Cosmic Star Formation History
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• The Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Milagro Observations of Multi-TeV Emission from Galactic Sources in the Fermi Bright Source List
• The Fermi-LAT high-latitude Survey: Source Count Distributions and the Origin of the Extragalactic Diffuse Background
• Star-forming galaxies as the origin of diffuse high-energy backgrounds: Gamma-ray and neutrino connections, and implications for starburst history
• Flavor Ratio of Astrophysical Neutrinos above 35 TeV in IceCube
• On the rate of core collapse supernovae in the Milky Way
• Constraining Very Heavy Dark Matter Using Diffuse Backgrounds of Neutrinos and Cascaded Gamma Rays
• Observations of M31 and M33 with the Fermi Large Area Telescope: a galactic center excess in Andromeda?
• Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background
• Gamma-Ray and Neutrino Backgrounds as Probes of the High-Energy Universe: Hints of Cascades, General Constraints, and Implications for TeV Searches
• Same-Sign Tetralepton Signature in Type-II Seesaw at Lepton Colliders

Cited by in corpus (1)

• The Cherenkov Telescope Array Will Test Whether Pulsars Generate the Galactic Center Gamma-Ray Excess