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Un transitorio inusualmente brillante en la galaxia M85
S R Kulkarni1, E O Ofek, A Rau
1Caltech Optical Observatories, California Institute of Technology, California 91125, USA. srk@astro.caltech.edu
Nature
|May 25, 2007
Resumen
Los astrónomos descubrieron un transitorio óptico brillante, M85 OT2006-1, en la galaxia Messier 85. Este evento de fusión estelar es más brillante que las novas pero más débil que las supernovas, ofreciendo nuevos conocimientos sobre la evolución estelar.
Área de la Ciencia:
- La astronomía es la astronomía.
- La astrofísica es la astrofísica.
- Los transitorios cósmicos.
Sus antecedentes:
- Las fuentes astronómicas variables y transitorias ofrecen nuevas perspectivas sobre el universo.
- Las galaxias lenticulares, como Messier 85, suelen estar pobladas por estrellas más viejas, lo que hace que los eventos transitorios inusuales sean notables.
Objetivo del estudio:
- Para informar sobre el descubrimiento y la caracterización inicial de un transitorio óptico significativo, M85 OT2006-1.
- Para investigar la naturaleza y el posible origen de este inusual evento celeste.
Principales métodos:
- Observación de un transitorio óptico en la galaxia Messier 85.
- Análisis de su pico de magnitud R absoluta y salida de energía.
- Comparación con los transitorios astronómicos conocidos como las novas y las supernovas.
- Examen de imágenes de archivo para excluir posibilidades como erupciones luminosas de estrellas variables azules.
Principales resultados:
- Descubrimiento de M85 OT2006-1, un transitorio óptico en Messier 85.
- Pico de magnitud R absoluta de -12, más brillante que las novas, más débil que las supernovas de tipo Ia.
- La energía total irradiada es de aproximadamente 10^47 erg durante dos meses.
- Transiente se desvaneció ópticamente después de su pico.
- El evento es seis veces más luminoso que un transitorio similar en M31.
Conclusiones:
- M85 OT2006-1 es un evento transitorio único, distinto de las típicas explosiones estelares.
- Una fusión estelar es una explicación plausible para las propiedades observadas.
- Las búsquedas adicionales de eventos similares pueden iluminar las fuentes hiper-Eddington y la evolución binaria estelar.
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