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Una galaxia enana distorsionada por las mareas cerca de NGC 444949

R M Rich¹, M L M Collins, C M Black

¹Department of Physics and Astronomy, University of California, Los Angeles, California 90095-1547, USA. rmr@astro.ucla.edu

|February 10, 2012

Resumen

Los astrónomos descubrieron NGC 4449B, una galaxia enana compañera que está sufriendo una interrupción de las mareas. Su estructura en forma de S ofrece nuevos conocimientos sobre las interacciones galácticas y la evolución del halo estelar.

Área de la Ciencia:

* La Astronomía Extragaláctica es una Astronomía extragaláctica.
* La evolución de las galaxias.
* La Dinámica Estelar es la Dinámica Estelar.

Sus antecedentes:

* NGC 4449 es una galaxia de estallido estelar irregular de Magallanes cercana con complejas estructuras de hidrógeno neutro (H I).
* Hipótesis anteriores sugirieron interacciones con DDO 125 para explicar la complejidad H I de NGC 4449.
* La galaxia alberga un núcleo masivo de edad intermedia.

Objetivo del estudio:

* Para investigar la naturaleza de una galaxia compañera recién descubierta de NGC 4449.9.
* Para analizar la morfología y la etapa evolutiva de este compañero.
* Para entender su impacto en la estructura de NGC 4449 y el halo estelar.

Principales métodos:

* Astronomía observacional utilizando técnicas avanzadas de imágenes y espectroscopia.
* Análisis morfológico de la galaxia compañera NGC 4449B.
* Evaluación de las firmas de las perturbaciones de las mareas y los componentes del halo estelar.

Principales resultados:

* Descubrimiento de NGC 4449B, una galaxia enana compañera con una magnitud absoluta de banda V de -13.4.4.
* NGC 4449B exhibe una fase transitoria de interrupción de las mareas con una morfología distintiva en forma de S.
* Detección de un halo estelar extendido de dos componentes en NGC 4449, alcanzando ~20 kpc.

Conclusiones:

* NGC 4449B está siendo activamente perturbada por las mareas, proporcionando un estudio de caso único similar al de la enana de Sagitario.
* La morfología en forma de S observada en NGC 4449B es un hallazgo significativo para las galaxias perturbadoras.
* El halo estelar extendido de NGC 4449 sugiere una compleja historia de acreción posiblemente influenciada por NGC 4449B.

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