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On the Galactic Center being the main source of galactic cosmic rays as evidenced by recent cosmic ray and gamma ray observations

Yuan, Qiang; Liu, Cheng; Hu, Hong-Bo +2 more

We revisit the idea that the Galactic Center (GC) is the dominant source of galactic cosmic rays (GCRs), based on a series of new observational evidence. A unified model is proposed to explain the new phenomena of GCRs and γ-rays simultaneously. The GCRs are thought to be accelerated during past activities of the GC. The pair production process of…

The dark matter interpretation of the 511 keV line

Bœhm, Céline

The 511 keV high-precision map obtained by the INTEGRAL/SPI experiment suggested a surprisingly large amount of positrons in our galaxy with respect to 'naive' astrophysical expectations. Although an astrophysical origin is not excluded, this signal may shed light on dark matter. Here we discuss a possible MeV dark matter interpretation of the 511…