Diffuse continuum gamma rays from the Galaxy

Abstract

A new study of the diffuse Galactic gamma-ray continuum radiation is presented, using a cosmic-ray propagation model which includes nucleons, antiprotons, electrons, positrons, and synchrotron radiation. Our treatment of the inverse Compton (IC) scattering includes the effect of anisotropic scattering in the Galactic interstellar radiation field (ISRF) and a new evaluation of the ISRF itself. Models based on locally measured electron and nucleon spectra and synchrotron constraints are consistent with gamma-ray measurements in the 30-500 MeV range, but outside this range excesses are apparent. A harder nucleon spectrum is considered but fitting to gamma rays causes it to violate limits from positrons and antiprotons. A harder interstellar electron spectrum allows the gamma-ray spectrum to be fitted above 1 GeV as well, and this can be further improved when combined with a modified nucleon spectrum which still respects the limits imposed by antiprotons and positrons. A large electron/IC halo is proposed which reproduces well the high-latitude variation of gamma-ray emission. The halo contribution of Galactic emission to the high-latitude gamma-ray intensity is large, with implications for the study of the diffuse extragalactic component and signatures of dark matter. The constraints provided by the radio synchrotron spectral index do not allow all of the <30 MeV gamma-ray emission to be explained in terms of a steep electron spectrum unless this takes the form of a sharp upturn below 200 MeV. This leads us to prefer a source population as the origin of the excess low-energy gamma rays.

Final version accepted for publication in The Astrophysical Journal (vol. 537, July 10, 2000 issue); Many Updates; 20 pages including 49 ps-figures, uses emulateapj.sty. More details can be found at http://www.gamma.mpe-garching.mpg.de/~aws/aws.html

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• The GALPROP Cosmic-ray Propagation and Non-thermal Emissions Framework: Release v57
• $\overline{\text{D}}$arkRayNet: Emulation of cosmic-ray antideuteron fluxes from dark matter
• Dark Matter Searches with the Fermi Large Area Telescope
• A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone
• Implications of the Fermi-LAT Pass 8 Galactic Center Excess on Supersymmetric Dark Matter
• Detection of VHE Gamma Radiation from the Pulsar Wind Nebula MSH 15-52 with H.E.S.S
• Limits on Dark Matter Annihilation from the Shape of Radio Emission in M31
• Revisiting the Equipartition Assumption in Star-forming Galaxies
• Dark Matter Experimental Overview
• Antiproton Flux in Cosmic Ray Propagation Models with Anisotropic Diffusion
• Perspective of Galactic dark matter subhalo detection on Fermi from the EGRET observation
• Constraining the cosmic ray propagation halo thickness using Fermi-LAT observations of high-latitude clouds
• The influence of the 3D Galactic gas structure on cosmic-ray transport and $\gamma$-ray emission
• GLAST Large Area Telescope Multiwavelength Planning
• Cosmic-Ray Induced Diffuse Emissions from the Milky Way and Local Group Galaxies