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, María Josefa, Tissera, Patricia Beatriz, Blaizot, Jeremy
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: interactions
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82658
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82658
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: interactions
spellingShingle Ciencias Astronómicas
Cosmology: theory
Galaxies: evolution
Galaxies: formation
Galaxies: interactions
Perez, María Josefa
Tissera, Patricia Beatriz
Blaizot, Jeremy
Building a control sample for galaxy pairs
topic_facet Ciencias Astronómicas
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.
format Articulo
Articulo
author Perez, María Josefa
Tissera, Patricia Beatriz
Blaizot, Jeremy
author_facet Perez, María Josefa
Tissera, Patricia Beatriz
Blaizot, Jeremy
author_sort Perez, María Josefa
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
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82658
work_keys_str_mv AT perezmariajosefa buildingacontrolsampleforgalaxypairs
AT tisserapatriciabeatriz buildingacontrolsampleforgalaxypairs
AT blaizotjeremy buildingacontrolsampleforgalaxypairs
bdutipo_str Repositorios
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