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El período orbital de la fuente de rayos X ultraluminosos en M82
Philip Kaaret1, Melanie G Simet, Cornelia C Lang
1Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, IA 52242, USA. philip-kaaret@uiowa.edu
Science (New York, N.Y.)
|January 10, 2006
Resumen
La fuente de rayos X ultraluminosos (ULX) en la galaxia M82 puede ser un agujero negro de masa intermedia. Su período orbital de 62 días sugiere una estrella donante gigante, lo que indica una fase evolutiva transitoria.
Área de la Ciencia:
- * Astrofísica es la astrofísica.
- * La astronomía es la ciencia.
- * Astronomía de rayos X en el campo de los rayos X.
Sus antecedentes:
- * Las fuentes de rayos X ultraluminosas (ULX) son fuentes puntuales de rayos X con luminosidades que exceden el límite de Eddington para los agujeros negros de masa estelar.
- * La galaxia M82 alberga un ULX prominente, un candidato potencial para un agujero negro de masa intermedia (IMBH).
- * Los cúmulos súper estelares son sitios de intensa formación estelar e interacciones dinámicas, que potencialmente pueden conducir a la formación de IMBH.
Objetivo del estudio:
- * Para investigar la naturaleza de la ULX en M82.
- * Para determinar el período orbital y las características del sistema binario ULX.
- * Para restringir la masa y el estado evolutivo del objeto compacto y su compañero.
Principales métodos:
- * Análisis de la modulación del flujo de rayos X de M82.2.
- * Determinación de la periodicidad de la emisión de rayos X.
- * Interpretación del período orbital en el contexto de la evolución binaria.
Principales resultados:
- * El flujo de rayos X del M82 ULX exhibe una modulación significativa.
- * Se identificó una periodicidad de 62,0 ± 2,5 días, interpretada como el período orbital.
- * El período orbital inferido sugiere que la estrella donante de masa es una gigante o supergigante.
Conclusiones:
- * El M82 ULX es probablemente un sistema binario de rayos X con un agujero negro de masa intermedia.
- * La estrella compañera está en su fase gigante, experimentando altas tasas de transferencia de masa.
- * El ULX observado representa una breve e inusual fase en la evolución del sistema binario.
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