Structure formation models weaken limits on WIMP dark matter from dwarf spheroidal galaxies
| Autor: | Alex Geringer-Sameth, Nagisa Hiroshima, Roberto Trotta, Matthew G. Walker, Sebastian Hoof, Shin'ichiro Ando |
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| Přispěvatelé: | GRAPPA (ITFA, IoP, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Structure formation
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Dark matter FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences High Energy Physics - Phenomenology (hep-ph) WIMP Settore FIS/05 - Astronomia e Astrofisica 0201 Astronomical and Space Sciences 0103 physical sciences Satellite galaxy Connection (algebraic framework) 0206 Quantum Physics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics astro-ph.HE Physics High Energy Astrophysical Phenomena (astro-ph.HE) Annihilation 010308 nuclear & particles physics hep-ph Nuclear & Particles Physics Galaxy High Energy Physics - Phenomenology 0202 Atomic Molecular Nuclear Particle and Plasma Physics astro-ph.CO Halo Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D, 102(6):061302. American Institute of Physics |
| ISSN: | 2470-0010 |
| Popis: | Dwarf spheroidal galaxies that form in halo substructures provide stringent constraints on dark matter annihilation. Many ultrafaint dwarfs discovered with modern surveys contribute significantly to these constraints. At present, because of the lack of abundant stellar kinematic data for the ultrafaints, non-informative prior assumptions are usually made for the parameters of the density profiles. Based on semi-analytic models of dark matter subhalos and their connection to satellite galaxies, we present more informative and realistic satellite priors. We show that our satellite priors lead to constraints on the annihilation rate that are between a factor of 2 and a factor of 7 weaker than under non-informative priors. As a result, the thermal relic cross section can at best only be excluded (with 95% probability) for dark matter masses of $\lesssim 40$ GeV from dwarf spheroidal data, assuming annihilation into $b\bar{b}$. Comment: 8 pages, 4 figures; with supplementary material (20 pages, 14 figures, 4 tables); revised version accepted for publication in Physical Review D Rapid Communications |
| Databáze: | OpenAIRE |
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