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Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations

Piccirillo, Erin; Blanchette, Keagan; Bozorgnia, Nassim; Strigari, Louis E.; Frenk, Carlos S.; Grand, Robert J.J.; Marinacci, Federico

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Authors

Erin Piccirillo

Keagan Blanchette

Nassim Bozorgnia

Louis E. Strigari

Robert J.J. Grand

Federico Marinacci



Abstract

We use the suite of Milky Way-like galaxies in the Auriga simulations to determine the contribution to annihilation radiation from dark matter subhalos in three velocity-dependent dark matter annihilation models: Sommerfeld, p-wave, and d-wave models. We compare these to the corresponding distribution in the velocity-independent s-wave annihilation model. For both the hydrodynamical and dark-matter-only simulations, only in the case of the Sommerfeld-enhanced annihilation does the total annihilation flux from subhalos exceed the total annihilation flux from the smooth halo component within the virial radius of the halo. Progressing from Sommerfeld to the s, p, and d-wave models, the contribution from the smooth component of the halo becomes more dominant, implying that for the p-wave and d-wave models the smooth component is by far the dominant contribution to the radiation. Comparing to the Galactic center excess observed by Fermi-LAT, for all simulated halos the emission is dominated by the smooth halo contribution. However, it is possible that for Sommerfeld models, extrapolation down to mass scales below the current resolution limit of the simulation would imply a non-negligible contribution to the gamma-ray emission from the Galactic Center region.

Citation

Piccirillo, E., Blanchette, K., Bozorgnia, N., Strigari, L. E., Frenk, C. S., Grand, R. J., & Marinacci, F. (2022). Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations. Journal of Cosmology and Astroparticle Physics, 2022(08), Article 058. https://doi.org/10.1088/1475-7516/2022/08/058

Journal Article Type Article
Acceptance Date Jul 21, 2022
Online Publication Date Aug 25, 2022
Publication Date 2022-08
Deposit Date Dec 15, 2022
Publicly Available Date Aug 26, 2023
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2022
Issue 08
Article Number 058
DOI https://doi.org/10.1088/1475-7516/2022/08/058
Public URL https://durham-repository.worktribe.com/output/1184471
Related Public URLs https://arxiv.org/abs/2203.08853

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Copyright Statement
This is the Accepted Manuscript version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1475-7516/2022/08/058






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