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We revisit the idea that the Galactic center (GC) is the dominant source ofGalactic cosmic rays (GCRs), based on a series of new observational evidence. Aunified model is proposed to explain the new phenomena of GCRs and$\gamma$-rays simultaneously. The GCRs are thought to be accelerated duringpast activities of the GC. The pair production process of GCRs in the strongradiation field due to the GC activity is responsible for the knee structure ofthe cosmic ray spectra. A f raction of $e^+e^-$ produced by pair productioninteractions, can be reaccelerated in the induced bipolar jets and betransported into the halo, leaving the Fermi $\gamma$-ray bubbles and WMAPmicrowave haze as the remnant signal. Finally, the CRs diffuse in the bulgecould further interact with the interstellar medium to produce low energy$e^+e^-$. After cooling down, these positrons may annihilate to produce the 511keV line emission as discovered by INTEGRAL.

On the Galactic Center Being the Main Source of Galactic Cosmic Rays as Evidenced by Recent Cosmic Ray and Gamma Ray Observations