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Microlente gravitacional producida por objetos de baja masa en el cúmulo globular M2222
K C Sahu1, S Casertano, M Livio
1Space Telescope Science Institute, Baltimore, MD 21218, USA. ksahu@stsci.edu
Nature
|June 29, 2001
Resumen
La microlente gravitacional del cúmulo globular M22 reveló un objeto de baja masa de 0,13 masas solares. Este estudio sugiere una población significativa de objetos de masa planetaria que flotan libremente dentro del cúmulo.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Investigación de exoplanetas Investigación de exoplanetas.
- Estudio de la estructura cósmica Estudios de la estructura cósmica
Sus antecedentes:
- La microlente gravitacional permite la determinación directa de la masa de los objetos celestes.
- Los cúmulos globulares ofrecen condiciones ideales para el microlenteado debido a la alta probabilidad de lenteado y la cinemática estelar restringida.
- El estudio de objetos de baja masa en cúmulos globulares proporciona información sobre la formación de estrellas en el universo temprano y la materia bariónica oscura.
Objetivo del estudio:
- Para determinar la masa de un objeto de lente dentro del cúmulo globular M22 utilizando microlente gravitacional.
- Investigar la abundancia de objetos de baja masa y potenciales objetos de masa planetaria flotantes en cúmulos globulares.
- Evaluar las implicaciones de los eventos de microlente para la comprensión de la composición de la formación estelar temprana.
Principales métodos:
- Observación de un cúmulo globular (M22) contra el denso campo estelar del bulto galáctico.
- Análisis de eventos de microlentes gravitacionales para identificar y caracterizar objetos de lente.
- Determinación de la masa de la lente a través de mediciones precisas de los parámetros de microlente.
Principales resultados:
- Un evento de microlentes asociado con el cúmulo globular M22 produjo una masa de lente de 0,13 masas solares.
- Se detectaron seis eventos no resueltos adicionales, lo que podría indicar microlentes.
- Estos hallazgos sugieren que una fracción sustancial de la masa del cúmulo puede comprender objetos de masa planetaria que flotan libremente.
Conclusiones:
- La microlente gravitacional es efectiva para la determinación de la masa en entornos estelares densos como los cúmulos globulares.
- El evento de microlentes de M22 apoya la presencia de objetos estelares o subestelares de baja masa.
- La detección potencial de objetos de masa planetaria que flotan libremente tiene implicaciones significativas para los modelos de formación estelar del universo temprano y la composición de la materia oscura.
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