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The origin of the cosmic gamma-ray background in the MeV range by Ruiz-Lapuente, Pilar; The, Lih-Sin; Hartmann, Dieter; Ajello, Marco; Canal, Ramon; Röpke, Friedrich K; Ohlmann, Sebastian T.; Hillebrandt, Wolfgang is a scholarly article available to read on EtoBox.

What is The origin of the cosmic gamma-ray background in the MeV range about?

There has been much debate about the origin of the diffuse $\gamma$--ray background in the MeV range. At lower energies, AGNs and Seyfert galaxies can explain the background, but not above $\simeq$0.3 MeV. Beyond $\sim$10 MeV blazars appear to account for the flux observed. That leaves an unexplained gap for which different candidates have been proposed, including annihilations of WIMPS. One candidate are Type Ia supernovae (SNe Ia). Early studies concluded that they were able to account for the $\gamma$--ray background in the gap, while later work attributed a significantly lower contribution to them. All those estimates were based on SN Ia explosion models which did not reflect the full 3D hydrodynamics of SNe Ia explosions. In addition, new measurements obtained since 2010 have provided new, direct estimates of high-z SNe Ia rates beyond $z\sim$2. We take into account these new advances to see the predicted contribution to the gamma--ray background. We use here a wide variety of explosion models and a plethora of new measurements of SNe Ia rates. SNe Ia still fall short of the observed background. Only for a fit, which would imply $\sim$150\% systematic error in detecting SNe Ia

Author

Ruiz-Lapuente, Pilar; The, Lih-Sin; Hartmann, Dieter; Ajello, Marco; Canal, Ramon; Röpke, Friedrich K; Ohlmann, Sebastian T.; Hillebrandt, Wolfgang

Published

2015

Language

EN