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Un viento de 100 kiloparsec alimentando el medio circumgaláctico de una galaxia compacta masiva
David S N Rupke1, Alison Coil2, James E Geach3
1Department of Physics, Rhodes College, Memphis, TN, USA. drupke@gmail.com.
Nature
|November 1, 2019
Resumen
Los vientos galácticos expulsan gas enriquecido con metales mucho más allá de las galaxias, formando grandes medios circumgalácticos e intergalácticos. Las observaciones revelan una salida masiva de una galaxia compacta de estallido estelar, depositando gas enriquecido a grandes distancias.
Área de la Ciencia:
- La astronomía
- La astrofísica
- Cosmología
Sus antecedentes:
- La mayoría de los bariones residen fuera de las galaxias en el medio circumgaláctico e intergaláctico.
- Los vientos galácticos se teorizan para suministrar este medio enriquecido.
- Los vientos observados de las explosiones estelares generalmente se extienden solo a ~ 10 kiloparsecs, más pequeños que el medio circumgaláctico.
Objetivo del estudio:
- Para investigar la extensión y la naturaleza de las salidas de galaxias compactas de estallido estelar.
- Para entender los mecanismos que impulsan el medio circumgaláctico e intergaláctico.
Principales métodos:
- Observaciones de campo integral óptico de la galaxia SDSS J211824.06+001729.4.
- Análisis de las líneas de emisión de oxígeno [O II] para mapear el flujo de salida de gas ionizado.
- Observación de las fases de gas neutro y sus velocidades.
Principales resultados:
- Se detectó una salida ionizada que abarcaba 80x100 kiloparsecs cuadrados.
- Se observó que el gas enriquecido con metal se depositaba a través de una nebulosa en forma de reloj de arena.
- Las fases de gas neutro alcanzaron los 20 kiloparsecs a velocidades de ~ 1,500 km / s.
Conclusiones:
- Las salidas masivas y multifásicas de estallidos compactos pueden enriquecer el medio circumgaláctico a grandes escalas.
- Estas salidas son consistentes con los modelos teóricos impulsados por explosiones de formación estelar.
- La estructura de salida observada apoya la idea de burbujas bipolares evacuadas.
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