English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/167450
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Título

Characterization of subhalo structural properties and implications for dark matter annihilation signals

AutorMoliné, Á.; Sánchez Conde, M. A.; Palomares-Ruiz, S.; Prada, Francisco
Palabras claveGalaxies: haloes
Dark matter
Cosmology: theory
Fecha de publicación2017
EditorOxford University Press
CitaciónMonthly Notices of the Royal Astronomical Society 466: 4974- 4990 (2017)
ResumenA prediction of the standard λ cold dark matter cosmology is that dark matter (DM) haloes are teeming with numerous self-bound substructure or subhaloes. The precise properties of these subhaloes represent important probes of the underlying cosmological model. We use data from Via Lactea II and Exploring the Local Volume in Simulations N-body simulations to learn about the structure of subhaloes with masses 10-10 hM. Thanks to a superb subhalo statistics, we study subhalo properties as a function of distance to host halo centre and subhalo mass, and provide a set of fits that accurately describe the subhalo structure. We also investigate the role of subhaloes on the search for DM annihilation. Previous work has shown that subhaloes are expected to boost the DM signal of their host haloes significantly. Yet, these works traditionally assumed that subhaloes exhibit similar structural properties than those of field haloes, while it is known that subhaloes are more concentrated. Building upon our N-body data analysis, we refine the substructure boost model of SA & Acute;nchez-Conde & Prada (2014), and find boosts that are a factor 2-3 higher. We further refine the model to include unavoidable tidal stripping effects on the subhalo population. For field haloes, this introduces a moderate (20-30 per cent) suppression. Yet, for subhaloes like those hosting dwarf galaxy satellites, tidal stripping plays a critical role, the boost being at the level of a few tens of percent at most. We provide a parametrization of the boost for field haloes that can be safely applied over a wide halo mass range.© 2017 The Authors.
URIhttp://hdl.handle.net/10261/167450
Identificadoresdoi: 10.1093/mnras/stx026
issn: 1365-2966
Aparece en las colecciones: (IAA) Artículos
(IFIC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
IAA_2017_stx026.pdf4,37 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.