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Evolution of Stellar Population: Environments vs galaxy interactions

Published online by Cambridge University Press:  13 April 2010

Josefa Perez ,
Patricia Tissera ,
Nelson Padilla ,
Sol Alonso  and
Diego G. Lambas
Josefa Perez
Affiliation:
Instituto de Astronomía y Física del Espacio, Conicet-UBA, CC67, Suc.28, Buenos Aires, Argentina. email: jperez@fcaglp.unlp.edu.ar Facultad de Ciencias Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Argentina.
Patricia Tissera
Affiliation:
Instituto de Astronomía y Física del Espacio, Conicet-UBA, CC67, Suc.28, Buenos Aires, Argentina. email: jperez@fcaglp.unlp.edu.ar Facultad de Ciencias Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina
Nelson Padilla
Affiliation:
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago, Chile.
Sol Alonso
Affiliation:
Facultad de Ciencias Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina Complejo Astronómico El Leoncito, CP J5402DSP, San Juan, Argentina.
Diego G. Lambas
Affiliation:
Facultad de Ciencias Astronomía y Geofísica, Universidad Nacional de La Plata, Argentina Observatorio Astronómico de la Universidad Nacional de Córdoba, Argentina.
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Abstract

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Several authors have studied the dependence of galaxy properties on environment in order to understand which mechanisms operate in the galaxy evolution. Recently, some of them have proposed that intermediate densities could be sites where local environment influences the transition of galaxies onto the red-sequence, as opposed to mechanisms that operate on cluster scales. Based on the evidence that interacting and merging systems are frequent at intermediate densities, we use the SDSS-DR4 data to analyse the role of close galaxy interactions as an environmental process which could contribute to lead evolutionary transformations. We explore the properties of galaxy pairs at different local and global density environments, comparing them with those of isolate galaxies in an unbiased control sample (CS).

Keywords

galaxies: evolutiongalaxies: interactionssurveys
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 408 - 409
Copyright
Copyright © International Astronomical Union 2010

References

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Perez, J., Tissera, P., Padilla, N., Alonso, S., & Lambas, D. G. 2009, in publication by MNRAS (Paper b, astroph/0904.2851)Google Scholar
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