Control sample for galaxy pairs: Simulations and Observations

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 Simulat...

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Detalles Bibliográficos
Autores principales: Perez, J., Tissera, P.
Formato: SER
Materias:
Galaxies: evolution
Galaxies: interactions
Surveys
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_17439213_v5_nS262_p410_Perez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_17439213_v5_nS262_p410_Perez
record_format dspace
spelling todo:paper_17439213_v5_nS262_p410_Perez2023-10-03T16:31:33Z Control sample for galaxy pairs: Simulations and Observations Perez, J. Tissera, P. Galaxies: evolution Galaxies: interactions Surveys 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. © International Astronomical Union 2010. SER info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17439213_v5_nS262_p410_Perez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: evolution
Galaxies: interactions
Surveys
spellingShingle Galaxies: evolution
Galaxies: interactions
Surveys
Perez, J.
Tissera, P.
Control sample for galaxy pairs: Simulations and Observations
topic_facet Galaxies: evolution
Galaxies: interactions
Surveys
description 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. © International Astronomical Union 2010.
format SER
author Perez, J.
Tissera, P.
author_facet Perez, J.
Tissera, P.
author_sort Perez, J.
title Control sample for galaxy pairs: Simulations and Observations
title_short Control sample for galaxy pairs: Simulations and Observations
title_full Control sample for galaxy pairs: Simulations and Observations
title_fullStr Control sample for galaxy pairs: Simulations and Observations
title_full_unstemmed Control sample for galaxy pairs: Simulations and Observations
title_sort control sample for galaxy pairs: simulations and observations
url http://hdl.handle.net/20.500.12110/paper_17439213_v5_nS262_p410_Perez
work_keys_str_mv AT perezj controlsampleforgalaxypairssimulationsandobservations
AT tisserap controlsampleforgalaxypairssimulationsandobservations
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