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El descubrimiento de un superviento de toda la galaxia de una galaxia masiva joven con desplazamiento al rojo z de
R J Wilman1, J Gerssen, R G Bower
1Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK. r.j.wilman@durham.ac.uk
Nature
|July 15, 2005
Resumen
Las salidas galácticas de alta velocidad impactan galaxias enteras, no sólo regiones de formación estelar. Las observaciones revelan una amplia y coherente pantalla de gas expulsada de una galaxia, lo que demuestra el efecto de los supervientos en toda la galaxia.
Área de la Ciencia:
- La evolución cósmica es la evolución cósmica.
- Formación y evolución de las galaxias.
- La astrofísica es la astrofísica.
Sus antecedentes:
- Las salidas galácticas son cruciales para las teorías de evolución de las galaxias, ya que regulan la formación de estrellas y enriquecen el medio intergaláctico.
- Las observaciones anteriores de galaxias con alto desplazamiento al rojo no eran claras sobre la extensión espacial de estas salidas.
Objetivo del estudio:
- Para investigar la extensión espacial y el impacto de las salidas galácticas de alta velocidad en una galaxia de alto desplazamiento al rojo.
- Para determinar si las salidas afectan a toda la galaxia o son localizadas.
Principales métodos:
- Espectroscopia bidimensional de una galaxia formadora de estrellas con desplazamiento al rojo z = 3.09.
- Análisis de la emisión de la línea Lyalpha extendida espacialmente y la absorción de H i.
- Medición de la extensión lateral y la coherencia de velocidad de la pantalla de gas absorbente.
Principales resultados:
- Se observó una emisión Lyalpha espacialmente extendida de una galaxia en z = 3.09.
- Descubrieron que la emisión fue absorbida por una pantalla H i de primer plano que cubría toda la galaxia.
- La pantalla tenía una extensión lateral de al menos 100 kpc y mostraba una notable coherencia de velocidad.
- La pantalla fue expulsada de la galaxia durante una explosión estelar pasada y había barrido el medio intergaláctico.
Conclusiones:
- Las salidas galácticas de alta velocidad, o supervientos, tienen un impacto en toda la galaxia.
- Estas salidas pueden influir significativamente en la galaxia y su medio intergaláctico circundante.
- El fenómeno observado demuestra las consecuencias a gran escala de las salidas impulsadas por estallidos estelares en el universo temprano.
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