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Anticorrelación de velocidad de satélites de galaxias diametralmente opuestas en el Universo de bajo desplazamiento
Neil G Ibata1, Rodrigo A Ibata2, Benoit Famaey2
1Lycée international des Pontonniers, 1 rue des Pontonniers, F-67000 Strasbourg, France.
Nature
|July 22, 2014
Resumen
Las galaxias satélite enanas alrededor de galaxias como la Vía Láctea y Andrómeda se encuentran a menudo en estructuras planas organizadas. Este estudio revela que estos planos satélites coherentes son comunes y poseen un momento angular significativo en el Universo local.
Área de la Ciencia:
- La astronomía galáctica es la astronomía galáctica.
- Cosmología Cosmología.
- La astrofísica es la astrofísica.
Sus antecedentes:
- Las galaxias satélite enanas alrededor de la Vía Láctea y Andrómeda exhiben alineaciones planas inesperadas.
- El entorno del Grupo Local puede no ser representativo de otras poblaciones galácticas.
Objetivo del estudio:
- Para investigar la prevalencia de estructuras de galaxias satélite planas en la población galáctica más amplia.
- Para determinar si las alineaciones y movimientos observados son exclusivos del Grupo Local.
Principales métodos:
- Medición de velocidades de galaxias satélite diametralmente opuestas.
- Analizando las correlaciones de velocidad de las parejas de satélites hasta 150 kiloparsecos.
- Mapeo de entornos galácticos a mayor escala hasta 2 megaparsecs.
Principales resultados:
- Los pares de satélites dentro de los 150 kiloparsecs muestran una anticorrelación preferencial de velocidad (99,994% de confianza).
- Los entornos galácticos de hasta 2 megaparsecs están fuertemente agrupados a lo largo del eje del par de satélites interiores (>7σ de confianza).
Conclusiones:
- Las estructuras planas de galaxias satélite co-rotativas parecen ubicuas, similares a las que rodean a Andrómeda.
- El movimiento coherente de estos planos satélite sugiere un depósito sustancial de momento angular en escalas kiloparsec.
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