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Las llamaradas de un magnetar galáctico candidato sugieren un eslabón perdido a las estrellas de neutrones aisladas
A J Castro-Tirado1, A de Ugarte Postigo, J Gorosabel
1Instituto de Astrofísica de Andalucía del Consejo Superior de Investigaciones Científicas (IAA-CSIC), PO Box 03004, E-18080 Granada, Spain. ajct@iaa.es
Nature
|September 27, 2008
Resumen
Los investigadores observaron una intensa llamarada óptica de SWIFT J195509+261406, lo que sugiere que se trata de un magnetar aislado. Este descubrimiento vincula los repetidores blandos de rayos gamma y las estrellas de neutrones aisladas débiles.
Área de la Ciencia:
- * Astronomía y astrofísica.
- * Astrofísica de alta energía.
- * Física de las estrellas de neutrones física de las estrellas de neutrones
Sus antecedentes:
- * Los magnetares son estrellas de neutrones jóvenes caracterizadas por campos magnéticos extremadamente potentes (10^14-10^15 G).
- * Normalmente se observan como repetidores blandos de rayos gamma (SGR) o como pulsares anómalos de rayos X (AXP).
- * Las contrapartes ópticas de las llamaradas de magnetar o los estados quiescentes han permanecido elusivas.
Objetivo del estudio:
- * Para investigar la naturaleza de la desconcertante fuente celeste SWIFT J195509+261406.
- * Para caracterizar su actividad de encendido a través de múltiples longitudes de onda.
- * Para determinar su clasificación potencial como un magnetar y su relación con otros tipos de estrellas de neutrones.
Principales métodos:
- * Observaciones de múltiples longitudes de onda, incluida la astronomía óptica, infrarroja y de radio.
- * Monitoreo de los episodios de inflamación durante un período prolongado.
- * Observaciones de radio para determinar el origen galáctico y estimar la distancia.
Principales resultados:
- * Se detectaron más de 40 episodios de encenso óptico de SWIFT J195509+261406 en un plazo de tres días.
- * Una débil llamarada infrarroja se observó 11 días después de la actividad óptica inicial.
- * Las observaciones de radio confirmaron el origen galáctico de la fuente y establecieron una distancia mínima de ~3.7 kpc.
Conclusiones:
- * Se propone que SWIFT J195509+261406 sea un magnetar aislado que exhibe actividad de ráfaga óptica.
- * Este evento sugiere una fase de emisión de rayos X potencialmente de corta duración para este magnetar.
- * La fuente puede representar un objeto de transición que conecta SGR/AXP persistentes con estrellas de neutrones aisladas tenues.
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