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Las bandas interestelares difusas infrarrojas en la región del Centro Galáctico

T R Geballe¹, F Najarro, D F Figer

¹Gemini Observatory, 670 N. A'ohoku Place, Hilo, Hawaii 96720, USA. tgeballe@gemini.edu

|November 4, 2011

Resumen

Los investigadores descubrieron 13 nuevas bandas interestelares difusas (BID) en el centro galáctico. Estas características de absorción cósmica, probablemente moléculas basadas en carbono, aparecen en un entorno más duro que los DIBs previamente observados.

Área de la Ciencia:

La astronomía es la astronomía.
La astrofísica es la astrofísica.
La espectroscopia es una técnica de espectroscopia.

Sus antecedentes:

Las bandas interestelares difusas (DIB) son características de absorción observadas en los espectros estelares debido al material interestelar.
Se conocen más de 500 DIB, principalmente en longitudes de onda visibles e infrarrojas cercanas.
Se sospecha que los portadores de DIBs son moléculas poliatómicas que contienen carbono, pero ninguna ha sido definitivamente identificada.

Objetivo del estudio:

Buscar y caracterizar nuevos DIB en longitudes de onda infrarrojas más largas (1.5-1.8 micrómetros).
Investigar el origen y el entorno de estos DIB recién descubiertos.
Para comparar las propiedades del DIB en el Centro Galáctico con las de otras nubes difusas.

Principales métodos:

Observaciones espectroscópicas de alta resolución de estrellas con alta extinción hacia el Centro Galáctico.
Análisis de espectros en el intervalo de longitud de onda de 1,5-1,8 micrómetros. análisis de espectros en el intervalo de longitud de onda de 1,5-1,8 micrómetros.
Comparación de las fuerzas de DIB con los valores de extinción interestelar.

Principales resultados:

Descubrimiento de 13 nuevas bandas interestelares difusas en el rango de 1,5-1,8 micrómetros.
Estos DIB se observan predominantemente hacia el Centro Galáctico, lo que sugiere un origen en esta región.
Las fuerzas relativas de estos DIBs se correlacionan con la extinción interestelar, similar a DIBs previamente conocidos.

Conclusiones:

El Centro Galáctico alberga bandas interestelares difusas previamente desconocidas, originadas en un entorno más cálido y áspero.
Es probable que los portadores de estos nuevos DIB sean similares a los de los DIB conocidos, posiblemente moléculas de carbono poliatómicas.
La intensidad del DIB generalmente aumenta con la cantidad de material interestelar difuso, independientemente del entorno específico.

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