Subhaloes gone Notts: subhaloes as tracers of the dark matter halo shape

Authors
Hoffmann, Kai; Planelles, Susana; Gaztañaga, Enrique; Knebe, Alexander; Pearce, Frazer R.; Lux, Hanni; Onions, Julian; Muldrew, Stuart I.; Elahi, Pascal; Behroozi, Peter; Ascasibar, Yago; Han, Jiaxin; Maciejewski, Michal; Merchan, Manuel Enrique; Neyrinck, Mark; Ruiz, Andrés Nicolás; Sgró, Mario Agustín
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
We study the shapes of subhalo distributions from four dark-matter-only simulations of Milky Way-type haloes. Comparing the shapes derived from the subhalo distributions at high resolution to those of the underlying dark matter fields, we find the former to be more triaxial if the analysis is restricted to massive subhaloes. For three of the four analysed haloes, the increased triaxiality of the distributions of massive subhaloes can be explained by a systematic effect caused by the low number of objects. Subhaloes of the fourth halo show indications for anisotropic accretion via their strong triaxial distribution and orbit alignment with respect to the dark matter field. These results are independent of the employed subhalo finder. Comparing the shape of the observed Milky Way satellite distribution to those of high-resolution subhalo samples from simulations, we find agreement for samples of bright satellites, but significant deviations if faint satellites are included in the analysis. These deviations might result from observational incompleteness.
Fil: Hoffmann, Kai. Instituto de Ciencias del Espacio. Barcelona; España
Fil: Planelles, Susana. Università degli Studi di Trieste; Italia
Fil: Gaztañaga, Enrique. Instituto de Ciencias del Espacio. Barcelona; España
Fil: Knebe, Alexander. Universidad Autónoma de Madrid; España
Fil: Pearce, Frazer R.. The University Of Nottingham; Reino Unido
Fil: Lux, Hanni. The University Of Nottingham; Reino Unido. University of Oxford; Reino Unido
Fil: Onions, Julian. The University Of Nottingham; Reino Unido
Fil: Muldrew, Stuart I.. The University Of Nottingham; Reino Unido. University of Leicester; Reino Unido
Fil: Elahi, Pascal. Shanghai Astronomical Observatory; China. The University of Sydney; Australia
Fil: Behroozi, Peter. Space Telescope Science Institute; Estados Unidos
Fil: Ascasibar, Yago. Universidad Autónoma de Madrid; España
Fil: Han, Jiaxin. Shanghai Astronomical Observatory; China. University Of Durham; Reino Unido
Fil: Maciejewski, Michal. Max-Planck-Institut f ̈ur Astrophysik; Alemania
Fil: Merchan, Manuel Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Neyrinck, Mark. University Johns Hopkins; Estados Unidos
Fil: Ruiz, Andrés Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Sgró, Mario Agustín. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Subject
methods: numerical
galaxies: haloes
cosmology: miscellaneous
Astronomía
Ciencias Físicas
CIENCIAS NATURALES Y EXACTAS
Access level
Open access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/33574