SIMBAD references

2007ApJ...654L..49S - Astrophys. J., 654, L49-L52 (2007/January-1)

Mid-infrared galaxy classification based on silicate obscuration and PAH equivalent width.

SPOON H.W.W., MARSHALL J.A., HOUCK J.R., ELITZUR M., HAO L., ARMUS L., BRANDL B.R. and CHARMANDARIS V.

Abstract (from CDS):

We present a new diagnostic diagram for mid-infrared spectra of infrared galaxies based on the equivalent width of the 6.2 µm PAH emission feature and the strength of the 9.7 µm silicate feature. Based on the positions in this diagram, we classify galaxies into nine classes ranging from continuum-dominated AGN hot dust spectra and PAH-dominated starburst spectra to absorption-dominated spectra of deeply obscured galactic nuclei. We find that galaxies are systematically distributed along two distinct branches: one of AGN and starburst-dominated spectra and one of deeply obscured nuclei and starburst-dominated spectra. The separation into two branches likely reflects a fundamental difference in the dust geometry in the two sets of sources: clumpy versus nonclumpy obscuration. Spectra of ULIRGs are found along the full length of both branches, reflecting the diverse nature of the ULIRG family.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: ISM - Galaxies: Starburst - Infrared: Galaxies

Simbad objects: 16

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2007ApJ...654L..49S and select 'bookmark this link' or equivalent in the popup menu


2021.02.24-22:27:32

© Université de Strasbourg/CNRS

    • Contact