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Veintiún pulsares de milisegundos en Terzan 5 usando el Telescopio de Green Bank
Scott M Ransom1, Jason W T Hessels, Ingrid H Stairs
1National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA. sransom@nrao.edu
Science (New York, N.Y.)
|January 18, 2005
Resumen
Los astrónomos descubrieron 21 pulsares de milisegundos (MSP) en el cúmulo globular Terzan 5 utilizando el Telescopio de Green Bank. Estos hallazgos apoyan las teorías de la evolución estelar y revelan estrellas de neutrones masivas, impactando nuestra comprensión de la materia en densidades extremas.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Objetos compactos Objetos compactos.
- Física de las estrellas de neutrones Física de las estrellas de neutrones
Sus antecedentes:
- Los cúmulos globulares son sistemas estelares densos que albergan diversas poblaciones de estrellas.
- Los púlsares de milisegundos (MSP) son estrellas de neutrones de rápida rotación cruciales para probar las teorías de la evolución estelar y la relatividad general.
Objetivo del estudio:
- Identificar y caracterizar pulsares de milisegundos dentro del cúmulo globular Terzan 5.
- Para investigar las propiedades de los sistemas binarios que contienen MSP para limitar las propiedades de las estrellas de neutrones.
Principales métodos:
- Utilizó el Telescopio de Green Bank para las observaciones de radio de Terzan 5.
- Análisis de los datos de tiempo para detectar y confirmar las señales de pulsar de milisegundos.
- Estudió los parámetros orbitales de los MSP binarios, incluyendo los efectos relativistas.
Principales resultados:
- Descubrieron 21 nuevos púlsares de milisegundos en Terzan 5, aumentando el total a 24.
- Se encontró que 13 de los nuevos MSP están en sistemas binarios, con dos que exhiben eclipses y dos que muestran órbitas excéntricas.
- Se midió el avance periastron relativista en dos sistemas, lo que indica que las masas de estrellas de neutrones superan las 1,68 masas solares.
Conclusiones:
- Los descubrimientos validan los modelos de la evolución de los cúmulos globulares y los sistemas binarios.
- Las altas masas de estrellas de neutrones desafían la ecuación de estado para la materia en densidades supra-nucleares.
- Estos hallazgos proporcionan datos cruciales para la física nuclear y astrofísica.
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