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A Spitzer study of interacting luminous and ultra-luminous infrared galaxies

Published online by Cambridge University Press:  17 August 2012

João Rodrigo S. Leão  and
Claus Leitherer
João Rodrigo S. Leão
Affiliation:
Universidade Federal do Rio Grande - FURG, Instituto de Matemática, Estatística e Fśica - IMEF Caixa Postal 474, Campus Carreiros, Rio Grande, RS, Brazil email: [email protected]
Claus Leitherer
Affiliation:
Space Telescope Science Institute 3700 San Martin Drive, Baltimore, MD, USA email: [email protected]
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Abstract

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We conducted a Spitzer Space Telescope survey of 28 Luminous (11 < log (LIR/L⊙) < 12, LIRGs) and Ultra-Luminous Infrared Galaxies (log (LIR/L⊙) > 12, ULIRGs). Many of these galaxies are found in pairs or associations and are powered by either nuclear activity or star-formation (Sanders & Mirabel 1996). Our main goal is to understand the relative importance of starbursts and AGNs in interacting systems. Is the frequency of AGN and starbursts in these interacting galaxies related to their luminosities? What is the importance of the merger stage and the frequency of AGNs? We present our conclusions and diagnostic diagrams based in the observed near infrared lines and compare to studies based solely in optical data.

Keywords

techniques: spectroscopygalaxies: starburstgalaxies: statisticsline: identificationgalaxies: interactions
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 202 - 204
Copyright
Copyright © International Astronomical Union 2012

References

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