Width of the 511 KeV Line from the Bulge of the Galaxy

Abstract

In this paper I present the detail estimations for the width of the 511 keV line produced by a mechanism when dark matter is represented by macroscopically large dense nuggets. I argue that the width of 511 keV emission in this mechanism is very narrow (in a few keV range) in agreement with all observations. The dominant mechanism of the annihilation in this case is the positronium formation e^+e^-to ^1S_0 to 2γrather than a direct e^+e^- to 2γ$ annihilation. I also discuss some generic features of the γrays spectrum (in few MeV range) resulting from this mechanism.

final version to appear in PRD

References in corpus (4)

• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• Cold Dark Matter as Compact Composite Objects
• Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?
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Cited by in corpus (16)

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• The Axion Quark Nugget Dark Matter Model: Size Distribution and Survival Pattern
• Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?
• Axion Quark Nuggets. Dark Matter and Matter-Antimatter asymmetry: theory, observations and future experiments
• Solar Extreme UV radiation and quark nugget dark matter model
• Quark Matter Induced Extensive Air Showers
• Radiation from matter-antimatter annihilation in the quark nugget model of dark matter
• The mysterious diffuse UV radiation and Axion Quark Nugget dark matter model
• Radio impulsive events in quiet solar corona and Axion Quark Nugget Dark Matter
• The Mysterious Bursts observed by Telescope Array and Axion Quark Nuggets
• X-ray annual modulation observed by XMM-Newton and Axion Quark Nugget Dark Matter
• 511 keV Line Emission from Nearby Spherical Dwarf Galaxies
• The Glow of Axion Quark Nugget Dark Matter: (I) Large Scale Structures
• The Glow of Axion Quark Nugget Dark Matter: (II) Galaxy Clusters
• Updated cosmological constraints on Macroscopic Dark Matter