PAHs as Tracers of Local AGN-Starburst Connection
Mario-A. Higuera-G.,1 and Andrés F. Ramos P.2
1 Observatorio Astronómico Nacional, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia. (mahiguerag@unal.edu.co).
2 Departamento de Física, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia. (aframosp@unal.edu.co).
]]> Received 2012 November 22.
RESUMEN
El objetivo central de este trabajo fue investigar cómo procesos energéticos asociados a la actividad de los núcleos activos de galaxias están vinculados con aquellos que son debidos a la actividad de formación estelar nuclear y circunnuclear. Se usaron datos fotométricos y espectroscópicos con el fin de discriminar estos procesos en un conjunto de galaxias con brote de formación estelar, galaxias infrarrojas y AGNs. Se proponen nuevos diagramas de diagnóstico basados en la emisión de PAH en 7.7 μm, la razón entre la emisión en el infrarrojo medio y lejano L(MIR, FIR) y el parámetro q. Los diagramas de diagnóstico permiten comparar el comportamiento de los cuasares y galaxias Seyfert 1- Seyfert 2 con las galaxias con brote, y los LIRGs-ULIRGs.
ABSTRACT
The main purpose of this research was to investigate how energetic processes associated with active galactic nuclei (AGN) are related to those due to nuclear or circumnuclear star formation activity. Photometric and spectroscopic data were used to discriminate between these processes in a sample of starburst, infrared galaxies and AGNs. Here, we propose new diagnostic diagrams based on the 7.7 μm polycyclic aromatic hydrocarbon emission band, the L(MIR,FIR) infrared ratio and the q parameter. The diagnostic diagrams allow us to discriminate the behavior of quasars and Seyfert 1-Seyfert 2 galaxies from starbursts and LIRGs-ULIRGs objects.
Key Words: galaxies: active — galaxies: general — galaxies: nuclei.
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