Associations of dwarf galaxies in a ΛCDM Universe
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 MultiD...
| Autores principales: | , , , , , , , , |
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| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2020
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/132493 |
| Aporte de: |
| id |
I19-R120-10915-132493 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía galaxies: dwarf galaxies: groups: general galaxies: kinematics and dynamics |
| spellingShingle |
Astronomía galaxies: dwarf galaxies: groups: general galaxies: kinematics and dynamics Yaryura, C. Yamila Abadi, M. G. Gottlöber, Stefan Libeskind, Noam I. Cora, Sofía Alejandra Ruiz, Andrés N. Vega Martínez, Cristian A. Yepes, Gustavo Behroozi, Peter Associations of dwarf galaxies in a ΛCDM Universe |
| topic_facet |
Astronomía galaxies: dwarf galaxies: groups: general galaxies: kinematics and dynamics |
| description |
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=0.4Mpch−1 to 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 threshold Mmax. 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 ∼0.2Mpch−1, velocity dispersion of ∼30kms−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. |
| format |
Articulo Preprint |
| author |
Yaryura, C. Yamila Abadi, M. G. Gottlöber, Stefan Libeskind, Noam I. Cora, Sofía Alejandra Ruiz, Andrés N. Vega Martínez, Cristian A. Yepes, Gustavo Behroozi, Peter |
| author_facet |
Yaryura, C. Yamila Abadi, M. G. Gottlöber, Stefan Libeskind, Noam I. Cora, Sofía Alejandra Ruiz, Andrés N. Vega Martínez, Cristian A. Yepes, Gustavo Behroozi, Peter |
| author_sort |
Yaryura, C. Yamila |
| title |
Associations of dwarf galaxies in a ΛCDM Universe |
| title_short |
Associations of dwarf galaxies in a ΛCDM Universe |
| title_full |
Associations of dwarf galaxies in a ΛCDM Universe |
| title_fullStr |
Associations of dwarf galaxies in a ΛCDM Universe |
| title_full_unstemmed |
Associations of dwarf galaxies in a ΛCDM Universe |
| title_sort |
associations of dwarf galaxies in a λcdm universe |
| publishDate |
2020 |
| url |
http://sedici.unlp.edu.ar/handle/10915/132493 |
| work_keys_str_mv |
AT yaryuracyamila associationsofdwarfgalaxiesinalcdmuniverse AT abadimg associationsofdwarfgalaxiesinalcdmuniverse AT gottloberstefan associationsofdwarfgalaxiesinalcdmuniverse AT libeskindnoami associationsofdwarfgalaxiesinalcdmuniverse AT corasofiaalejandra associationsofdwarfgalaxiesinalcdmuniverse AT ruizandresn associationsofdwarfgalaxiesinalcdmuniverse AT vegamartinezcristiana associationsofdwarfgalaxiesinalcdmuniverse AT yepesgustavo associationsofdwarfgalaxiesinalcdmuniverse AT behroozipeter associationsofdwarfgalaxiesinalcdmuniverse |
| bdutipo_str |
Repositorios |
| _version_ |
1764820453985091584 |