Building a control sample for galaxy pairs

Several observational works have attempted to isolate the effects of galaxy interactions by comparing galaxies in pairs with isolated galaxies. However, different authors have proposed different ways to build these so-called control samples (CS). By using mock galaxy catalogues of the Sloan Digital...

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Detalles Bibliográficos
Autores principales:	Perez, J., Tissera, P., Blaizot, J.
Formato:	JOUR
Materias:	Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: interactions
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p748_Perez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_00358711_v397_n2_p748_Perez2023-10-03T14:46:54Z Building a control sample for galaxy pairs Perez, J. Tissera, P. Blaizot, J. Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: interactions Several observational works have attempted to isolate the effects of galaxy interactions by comparing galaxies in pairs with isolated galaxies. However, different authors have proposed different ways to build these so-called control samples (CS). By using mock galaxy catalogues of the Sloan Digital Sky Survey Data Release 4 buildup from the Millennium Simulation, we explore how the way of building a CS might introduce biases which could affect the interpretation of results. We make use of the fact that the physics of interactions are not included in the semi-analytic model, to infer that any difference between the mock control and pair samples can be ascribed to selection biases. Thus, we find that galaxies in pairs artificially tend to be older and more bulge dominated, and to have less cold gas and different metallicities than their isolated counterparts. Also because of a biased selection, galaxies in pairs tend to live in higher density environments and in haloes of larger masses. We find that imposing constraints on redshift, stellar masses and local densities diminishes the selection biases by ≈70 per cent. Based on these findings, we suggest observers how to build a unique and unbiased CS in order to reveal the effect of galaxy interactions. © 2009 RAS. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p748_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	Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: interactions
spellingShingle	Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: interactions Perez, J. Tissera, P. Blaizot, J. Building a control sample for galaxy pairs
topic_facet	Cosmology: theory Galaxies: evolution Galaxies: formation Galaxies: interactions
description	Several observational works have attempted to isolate the effects of galaxy interactions by comparing galaxies in pairs with isolated galaxies. However, different authors have proposed different ways to build these so-called control samples (CS). By using mock galaxy catalogues of the Sloan Digital Sky Survey Data Release 4 buildup from the Millennium Simulation, we explore how the way of building a CS might introduce biases which could affect the interpretation of results. We make use of the fact that the physics of interactions are not included in the semi-analytic model, to infer that any difference between the mock control and pair samples can be ascribed to selection biases. Thus, we find that galaxies in pairs artificially tend to be older and more bulge dominated, and to have less cold gas and different metallicities than their isolated counterparts. Also because of a biased selection, galaxies in pairs tend to live in higher density environments and in haloes of larger masses. We find that imposing constraints on redshift, stellar masses and local densities diminishes the selection biases by ≈70 per cent. Based on these findings, we suggest observers how to build a unique and unbiased CS in order to reveal the effect of galaxy interactions. © 2009 RAS.
format	JOUR
author	Perez, J. Tissera, P. Blaizot, J.
author_facet	Perez, J. Tissera, P. Blaizot, J.
author_sort	Perez, J.
title	Building a control sample for galaxy pairs
title_short	Building a control sample for galaxy pairs
title_full	Building a control sample for galaxy pairs
title_fullStr	Building a control sample for galaxy pairs
title_full_unstemmed	Building a control sample for galaxy pairs
title_sort	building a control sample for galaxy pairs
url	http://hdl.handle.net/20.500.12110/paper_00358711_v397_n2_p748_Perez
work_keys_str_mv	AT perezj buildingacontrolsampleforgalaxypairs AT tisserap buildingacontrolsampleforgalaxypairs AT blaizotj buildingacontrolsampleforgalaxypairs
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Building a control sample for galaxy pairs

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