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Control sample for galaxy pairs: Simulations and Observations

Published online by Cambridge University Press:  13 April 2010

Josefa Perez  and
Patricia Tissera
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.
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Abstract

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Several attempts have been made in order to isolate the effect of galaxy interactions by comparing galaxy in pairs with isolated galaxies. However, different authors have proposed different ways to build these control samples (CS). By using mock galaxy catalagues built up from the Millennium Simulation, we show that the set of constrains used to define a CS might introduce biases which could affect the interpretation of results. In this analysis, we make use of the fact that the physics of interactions is not included in the semi-analytic model, so that any difference between the mock control and pair samples can be attributed to selection biases. Thus, we suggest how to build an unique and unbiased CS in order to individualize the effect of interactions. Based on this theoretical findings and using the SDSS-DR4 data, we revise some previous observational results of galaxy in pairs in order to evaluate any possible disagreement. The comparison between simulations and observations suggests an overestimated effect of the DM halo bias in semianalytical models.

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. 410 - 411
Copyright
Copyright © International Astronomical Union 2010

References

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