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Un par de cuásares cercanos en una fusión de galaxias de disco en z = 2.17
Yu-Ching Chen1,2, Xin Liu3,4, Adi Foord5
1Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
Nature
|April 5, 2023
Resumen
Los astrónomos descubrieron el primer sistema de cuásares duales a escala kpc en el mediodía cósmico, SDSS J0749+2255, alojado por una fusión de galaxias. Este hallazgo proporciona información crucial sobre la evolución del agujero negro supermasivo durante el pico de actividad cósmica.
Área de la Ciencia:
- * Astronomía y astrofísica
- * Evolución de las galaxias
- * Cosmología
Sus antecedentes:
- * Se sabe que las fusiones de galaxias producen pares de agujeros negros supermasivos (SMBH).
- * Estos pares de SMBH se pueden observar como cuásares duales cuando ambos están acrecentándose activamente, particularmente en separaciones a escala kiloparsec (kpc).
- * Si bien se han encontrado núcleos galácticos activos duales a escala kpc en fusiones de bajo desplazamiento al rojo, no se ha identificado un cuásar dual inequívoco al mediodía cósmico (z ≈ 2).
Objetivo del estudio:
- * Para informar sobre el descubrimiento y la caracterización de un sistema de cuásares duales a escala kpc al mediodía cósmico.
- * Para investigar las propiedades de la galaxia anfitriona y las pruebas de fusión para este sistema.
- * Para entender las implicaciones para la formación y evolución de agujeros negros supermasivos.
Principales métodos:
- * Observaciones de múltiples longitudes de onda del estudio del cielo digital de Sloan (SDSS) J0749+2255.
- * Análisis de galaxias anfitrionas extendidas y características de marea de bajo brillo superficial.
- * Examen de la separación de núcleos de cuásares y la morfología de la galaxia anfitriona.
Principales resultados:
- * Identificación de SDSS J0749+2255 como un sistema de doble cuásar a escala kpc (separación de 3,8 kpc) con desplazamiento al rojo z = 2,17.
- * Descubrimiento de galaxias anfitrionas extendidas y características de marea, confirmando una fusión de galaxias.
- * Observación de que las galaxias anfitrionas son masivas, compactas y dominadas por discos, sin protuberancias estelares prominentes.
Conclusiones:
- * Este es el primer sistema de cuásares duales de escala kpc sin ambigüedades encontrado en el mediodía cósmico.
- * Las propiedades de la galaxia anfitriona sugieren que los SMBH pueden formarse antes que sus protuberancias estelares anfitrionas.
- * El sistema está en una trayectoria para formar potencialmente un SMBH binario gravitatorio dentro de aproximadamente 0.22 Gyr.
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