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Artículo

Associations of dwarf galaxies in a λCDM Universe

Yaryura, Claudia YamilaIcon ; Abadi, Mario GabrielIcon ; Gottlöber, Stefan; Libeskind, Noam I.; Cora, Sofia AlejandraIcon ; Ruiz, Andrés NicolásIcon ; Vega Martínez, Cristian AntonioIcon ; Yepes, Gustavo; Behroozi, Peter
Fecha de publicación: 10/2020
Editorial: Wiley Blackwell Publishing, Inc
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
e-ISSN: 1365-2966
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Associations of dwarf galaxies are loose systems composed exclusively of dwarf galaxies. These systems were identified in the Local Volume for the first time more than 30 yr ago. We study these systems in the cosmological framework of the λ cold dark matter (λCDM) model.We consider the Small MultiDark Planck simulation and populate its dark matter haloes by applying the semi-analytic model of galaxy formation SAG. We identify galaxy systems using a friends-of-friends algorithm with a linking length equal to b = 0.4Mpc h-1to reproduce the size of dwarf galaxy associations detected in the Local Volume. Our samples of dwarf systems are built up removing those systems that have one or more galaxies with stellar mass larger than a maximum thresholdMmax.We analyse three different samples defined by log10(Mmax[M⊙ h-1]) = 8.5, 9.0, and 9.5. On average, our systems have typical sizes of ∼ 0.2Mpc h-1, velocity dispersion of ∼ 30km s-1, and estimated total mass of ∼ 1011M⊙ h-1. Such large typical sizes suggest that individual members of a given dwarf association reside in different dark matter haloes and are generally not substructures of any other halo. Indeed, in more than 90 per cent of our dwarf systems their individual members inhabit different dark matter haloes, while only in the remaining 10 per cent members do reside in the same halo. Our results indicate that the λCDM model can naturally reproduce the existence and properties of dwarf galaxies' associations without much difficulty.
Palabras clave: GALAXIES: DWARF , GALAXIES: GROUPS: GENERAL , GALAXIES: KINEMATICS AND DYNAMICS
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/140912
URL: https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/staa3197/593664
DOI: http://dx.doi.org/10.1093/mnras/staa3197
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Articulos(IATE)
Articulos de INST.DE ASTRONOMIA TEORICA Y EXPERIMENTAL
Citación
Yaryura, Claudia Yamila; Abadi, Mario Gabriel; Gottlöber, Stefan; Libeskind, Noam I.; Cora, Sofia Alejandra; et al.; Associations of dwarf galaxies in a λCDM Universe; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 499; 4; 10-2020; 5932-5940
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