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Descubrimiento de hidrógeno molecular en una nube de alta velocidad del halo galáctico
P Richter1, K S de Boer, H Widmann
1Sternwarte der Universität Bonn, Germany. prichter@astro.uni-bonn.de
Nature
|December 10, 1999
Resumen
Los investigadores descubrieron hidrógeno molecular en una nube de alta velocidad, lo que indica que se originó en el disco de la Vía Láctea. Este hallazgo ayuda a explicar el origen de estas misteriosas nubes de gas galáctico.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Dinámica Galáctica es la dinámica galáctica.
- Composición del medio interestelar La composición del medio interestelar
Sus antecedentes:
- El halo de la Vía Láctea alberga nubes de alta velocidad (HVC) con orígenes poco conocidos.
- Su movimiento se desvía de la rotación galáctica, lo que dificulta la determinación de la masa y el origen.
- Dos teorías principales proponen que las CVH se originan a partir de flujos de salida galácticos o de acreción intergaláctica.
Objetivo del estudio:
- Para investigar el origen de las nubes de alta velocidad en la Vía Láctea.
- Para diferenciar entre fuentes intergalácticas internas o intergalácticas externas para los HVC.
- Para analizar la composición de un HVC específico para inferir su historia.
Principales métodos:
- Detección de la absorción de hidrógeno molecular en un HVC.
- Análisis espectroscópico del HVC hacia la Gran Nube de Magallanes.
- Determinación de la abundancia de hierro dentro del HVC.
Principales resultados:
- Descubrimiento de la absorción de hidrógeno molecular en una nube específica de alta velocidad.
- La abundancia de hierro medida en este HVC es aproximadamente el 50% del valor solar.
- La presencia de hidrógeno molecular y metalicidad sugiere un origen dentro de la Vía Láctea.
Conclusiones:
- La nube de alta velocidad estudiada probablemente se originó del gas expulsado del disco de la Vía Láctea.
- Los hallazgos apoyan las teorías que involucran fuentes o flujos de salida galácticos.
- Esta investigación proporciona evidencia observacional crucial para los mecanismos de formación de CVH.
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