Abstract
Abstract Recent observations indicate that a high production rate of positrons (strong 511 keV line) and a significant amount of excess GeV gamma-ray exist in our Galactic bulge. The latter issue can be explained by ∼40 GeV dark matter annihilation through $b \bar{b}$ channel while the former one remains a mystery. On the other hand, recent studies reveal that a large amount of high-density gas might exist near the Galactic Centre million years ago to account for the young, massive stars extending from 0.04–7 pc. In this Letter, I propose a new scenario and show that the 40 GeV dark matter annihilation model can also explain the required positron production rate (511 keV line) in the bulge due to the existence of the high-density gas cloud near the supermassive black hole long time ago.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
