511 keV Line Emission from Nearby Spherical Dwarf Galaxies

Abstract

The observed galactic 511 keV line has been interpreted in a number of papers as a possible signal of dark matter annihilation within the galactic bulge. If this is the case then we should expect a similar spectral feature associated with nearby dwarf galaxies which are dark matter dominated. It has recently been argued [1] that the absence of such a signal excludes a dark matter explanation as the major source for the galactic 511 keV line. In the model presented here dark matter in the form of heavy quark nuggets produces the galactic 511 keV emission line through interactions with the visible matter. It is argued, however, that this type of interaction is not subject to the strong dark matter annihilation constraints presented in [1].

10 pages, two figures

References in corpus (6)

• A common mass scale for satellite galaxies of the Milky Way
• Cold Dark Matter as Compact Composite Objects
• Search for 511 keV Emission in Satellite Galaxies of the Milky Way with INTEGRAL/SPI
• Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?
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• The sky distribution of 511 keV positron annihilation line emission as measured with INTEGRAL/SPI

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• The Sensitivity of Future Gamma-Ray Telescopes to Primordial Black Holes
• The 511-CAM Mission: A Pointed 511 keV Gamma-Ray Telescope with a Focal Plane Detector Made of Stacked Transition Edge Sensor Microcalorimeter Arrays
• Possibility of antiquark nuggets detection using meteor searching radars