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Title:Classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation
Authors:ID Lacroix, Thomas, IFT UAM-CSIC (Author)
ID Facchinetti, Gaetán, Université Libre de Bruxelles (Author)
ID Pérez Romero, Judit, IFT UAM-CSIC (Author)
ID Stref, Martin, LAPTh Université Grenoble Alps (Author)
ID Lavalle, Julien, LUMP Université Montpellier (Author)
ID Maurin, David, LPSC Université Grenoble Alps (Author)
ID Sánchez-Conde, Miguel, IFT UAM-CSIC (Author)
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Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Gamma-ray observations have long been used to constrain the properties of dark matter (DM), with a strong focus on weakly interacting massive particles annihilating through velocity-independent processes. However, in the absence of clear-cut observational evidence for the simplest candidates, the interest of the community in more complex DM scenarios involving a velocity-dependent cross-section has been growing steadily over the past few years. We present the first systematic study of velocity-dependent DM annihilation (in particular p-wave annihilation and Sommerfeld enhancement) in a variety of astrophysical objects, not only including the well-studied Milky Way dwarf satellite galaxies, but nearby dwarf irregular galaxies and local galaxy clusters as well. Particular attention is given to the interplay between velocity dependence and DM halo substructure. Uncertainties related to halo mass, phase-space and substructure modelling are also discussed in this velocity-dependent context. We show that, for s-wave annihilation, extremely large subhalo boost factors are to be expected, up to 10^11 in clusters and up to 10^6–10^7 in dwarf galaxies where subhalos are usually assumed not to play an important role. Boost factors for p-wave annihilation are smaller but can still reach 10^3 in clusters. The angular extension of the DM signal is also significantly impacted, with e.g. the cluster typical emission radius increasing by a factor of order 10 in the s-wave case. We also compute the signal contrast of the objects in our sample with respect to annihilation happening in the Milky Way halo. Overall, we find that the hierarchy between the brightest considered targets depends on the specific details of the assumed particle-physics model.
Keywords:dark matter theory, dwarf galaxies, galaxy clusters, gamma-ray theory
Publication version:Version of Record
Number of pages:53
Numbering:JCAP10(2022)021, 2022
PID:20.500.12556/RUNG-7901 New window
COBISS.SI-ID:139708419 New window
DOI:10.1088/1475-7516/2022/10/021 New window
Publication date in RUNG:27.01.2023
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Record is a part of a journal

Title:Journal of Cosmology and Astroparticle Physics
Shortened title:JCAP