Skip to Main content Skip to Navigation
Journal articles

Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations

Abstract : We compare the full-sky morphology of the 511 keV gamma ray excess measured by the INTEGRAL/SPI experiment to predictions of models based on dark matter (DM) scatterings that produce low-energy positrons: either MeV-scale DM that annihilates directly into e+e- pairs, or heavy DM that inelastically scatters into an excited state (XDM) followed by decay into e+e- and the ground state. By direct comparison to the data, we find that such explanations are consistent with dark matter halo profiles predicted by numerical many-body simulations for a Milky Way-like galaxy. Our results favor an Einasto profile over the cuspier NFW distribution and exclude decaying dark matter scenarios whose predicted spatial distribution is too broad. We obtain a good fit to the shape of the signal using six fewer degrees of freedom than previous empirical fits to the 511 keV data. We find that the ratio of flux at Earth from the galactic bulge to that of the disk is between 1.9 and 2.4, taking into account that 73% of the disk contribution may be attributed to the beta decay of radioactive 26Al.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03612442
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, March 17, 2022 - 5:25:45 PM
Last modification on : Friday, March 18, 2022 - 3:41:07 AM

Links full text

Identifiers

Collections

Citation

Aaron C. Vincent, Pierrick Martin, James M. Cline. Interacting dark matter contribution to the galactic 511 keV gamma ray emission: constraining the morphology with INTEGRAL/SPI observations. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2012, 2012, ⟨10.1088/1475-7516/2012/04/022⟩. ⟨insu-03612442⟩

Share

Metrics

Record views

6