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La supresión de la formación estelar por poderosos núcleos galácticos activos
M J Page1, M Symeonidis, J D Vieira
1Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT, UK. mjp@mssl.ucl.ac.uk
Nature
|May 12, 2012
Resumen
Los agujeros negros masivos en las galaxias pueden regular la formación de estrellas. Los poderosos núcleos galácticos activos (AGN) parecen suprimir la vigorosa formación estelar en sus galaxias anfitrionas, influyendo en la evolución galáctica.
Área de la Ciencia:
- * Astrofísica y astrofísica.
- * La evolución de las galaxias.
- * Cosmología * Cosmología.
Sus antecedentes:
- * Los agujeros negros masivos y las protuberancias galácticas son reliquias de la historia cósmica temprana con altas tasas de formación estelar.
- * Se sospecha que existe un vínculo entre la masa del agujero negro y la masa del bulto estelar, posiblemente debido a que los núcleos galácticos activos (AGN) apagan la formación de estrellas.
- * Los rayos X son trazadores inequívocos de AGN, mientras que las galaxias de formación estelar a menudo están oscurecidas por el polvo y brillan en longitudes de onda infrarrojas / submilimétricas.
Objetivo del estudio:
- * Investigar la relación entre los núcleos galácticos activos (AGN) y la formación de estrellas en las primeras galaxias.
- * Para probar la hipótesis de que la actividad AGN suprime la formación de estrellas en las galaxias anfitrionas.
Principales métodos:
- * Observaciones submilimétricas y de rayos X combinadas de galaxias galaxias anfitrionas.
- * Análisis de la luminosidad de rayos X y las tasas de formación estelar en galaxias con edades cósmicas de 2-6 mil millones de años.
Principales resultados:
- * La formación rápida de estrellas prevaleció en las galaxias anfitrionas de AGN cuando el Universo tenía entre 2 y 6 mil millones de años.
- * La formación estelar vigorosa fue suprimida alrededor de agujeros negros que exceden una luminosidad de rayos X de 10~44 ergs por segundo.
- * Se observa una clara supresión de la formación estelar en las galaxias anfitrionas de los poderosos AGN.
Conclusiones:
- * La poderosa actividad AGN parece apagar la formación de estrellas en sus galaxias anfitrionas.
- * Esta supresión se alinea con los modelos en los que las salidas de AGN expulsan el medio interestelar, transformando rápidamente las propiedades de las galaxias.
- * Los hallazgos apoyan el papel de la retroalimentación AGN en la regulación de la evolución de las galaxias.
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