Galactic Diffuse Emission Spectrum between 0.5 and 8.0 MeV and between 30 keV and 8 MeV for the search of PBH Dark Matter

Spectra and response files of the soft gamma-ray spectrum from Inverse Compton scattering in the Milky Way between 0.5 and 8.0 MeV, measured with INTEGRAL/SPI. The fluxes have been extracted with spimodfit assuming GALPROP v56 models according to Voyager 1, AMS-02, and Fermi/LAT data, plus different variants to change the interstellar radiation field, the diffusion properties, or the cosmic-ray halo size. The respective galdef files are included. In particular:

• voyager: propagation model of Bisschoff et al. (2019), Table 2
• voyager_Dg10001: \(\delta_1 = 0\)
• voyager_Dg1Dg205: \(\delta_1 = \delta_2 = 0.5\)
• voyager_ISRFopt10: factor 10 stronger optical ISFR
• voyager_z8kpc_KL: thick halo with 8 kpc half-thickness

In addition, there are spectra from 30 keV to 8 MeV (spec_0030-8000keV_<name>.fits), separated into:

• CV: spectrum of unresolved point sources in the Galactic plane, mostly cataclysmic variables (strong systematics)
• IC: spectrum of Inverse Compton scattering of cosmic ray GeV electrons (see above)
• positronium: spectrum of positronium decay (annihilation of electrons with positrons after intermediate bound state)
• NFW: spectrum of dark matter contributions that would follow a Navarro Frenk White density profile (mostly consistent with zero)
• total: spectrum of the above combined