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

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

2006-07-17

arxiv.org/abs/astro-ph/0607361v2

Phys.Rev.D76:103518,2007

Astronomy and Astrophysics

Astrophysics

final version to appear in PRD

Scientific paper

10.1103/PhysRevD.76.103518

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 2\gamma rather than a direct e^+e^- to 2\gamma$ annihilation. I also discuss some generic features of the \gamma rays spectrum (in few MeV range) resulting from this mechanism.

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