MeV All Sky

This page provides materials for the MeV gamma-ray sky (source catalog and all-sky maps). The source catalog is produced by a cross-matching of the hard X-ray (by Swift-BAT) and GeV gamma-ray (Fermi-LAT) catalogs. The all-sky maps made use of GALPROP for Galactic diffuse emission, the source catalog, and cosmic gamma-ray background (CGB) model by COMPTEL and SMM.

View the Project on GitHub tsuji703/MeV-All-Sky

MeV gamma-ray diffuse emission

Extragalactic emission

\[I(E) = K \left( \frac{E}{E_{\rm ref}} \right) ^{-\Gamma}\]

COMPTEL

E = 0.8 to 30 MeV
$\Gamma$ = 3.3 for E < 3 MeV and $\Gamma$ = 2 for E > 3 MeV
$K$ = $2.2 \times 10^{-4}$ /(MeV cm$^2$ s sr)
$E_{\rm ref}$ = 3 MeV

SMM (Solar Maximum Mission) Gamma-Ray Spectrometer (GRS)

E = 0.3 to 6 MeV
$\Gamma$ = 2.7
$K$ = $3.8 \times 10^{-3}$ /(MeV cm$^2$ s sr)
$E_{\rm ref}$ = 1 MeV

Fermi

E = 100 MeV to 1 TeV
$\Gamma$ = 2.31
$K$ = $1.48 \times 10^{-7}$ /(MeV cm$^2$ s sr)
(additional copmonent) $E_{\rm cut}$ = 362 GeV
$E_{\rm ref}$ = 100 MeV

Reference

COMPTEL: Kappadath et al. 1997
COMPTEL: Kappadath 1998
COMPTEL: Weidenspointner 2000
SMM: Watanabe 2000
Fermi: Ackermann+ 2015; Model A (Table 6)