Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis

We present an observational study of the impacts of the interactions on the stellar population in a sample of galaxy pairs. Long-slit spectra in the wavelength range 3440-7300 Å obtained with the Gemini Multi-Object Spectrograph (GMOS) at Gemini South for fifteen galaxies in nine close pairs were us...

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Detalles Bibliográficos
Autores principales: Krabbe, A., Rosa, D. A., Pastoriza, Miriani Griselda, Hägele, Guillermo Federico, Cardaci, Mónica Viviana, Dors, O. L., Winge, C.
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Astronómicas
Galaxies: evolution
Galaxies: interactions
Galaxies: stellar content
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125245
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125245
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
Galaxies: evolution
Galaxies: interactions
Galaxies: stellar content
spellingShingle Ciencias Astronómicas
Galaxies: evolution
Galaxies: interactions
Galaxies: stellar content
Krabbe, A.
Rosa, D. A.
Pastoriza, Miriani Griselda
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Dors, O. L.
Winge, C.
Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
topic_facet Ciencias Astronómicas
Galaxies: evolution
Galaxies: interactions
Galaxies: stellar content
description We present an observational study of the impacts of the interactions on the stellar population in a sample of galaxy pairs. Long-slit spectra in the wavelength range 3440-7300 Å obtained with the Gemini Multi-Object Spectrograph (GMOS) at Gemini South for fifteen galaxies in nine close pairs were used. The spatial distributions of the stellar population contributions were obtained using the stellar population synthesis code STARLIGHT. Taking into account the different contributions to the emitted light, we found that most of the galaxies in our sample are dominated by the young/intermediate stellar populations. This result differs from the one derived for isolated galaxies where the old stellar population dominates the disc surface brightness. We interpreted such different behavior as being due to the effect of gas inflows along the disk of interacting galaxies on the star formation in a time scale of the order of about 2Gyr. We also found that, in general, the secondary galaxy of the pairs has a higher contribution of the young stellar population than the primary one. We compared the estimated values of the stellar and nebular extinctions derived from the synthesis method and the Hα/Hβ emission-line ratio finding that the nebular extinctions are systematically higher than stellar ones by about a factor of 2. We did not find any correlation between nebular and stellar metallicities. We neither found a correlation between stellar metallicities and ages while a positive correlation between nebular metallicities and stellar ages was obtained, with the older regions being the most metal-rich.
format Articulo
Preprint
author Krabbe, A.
Rosa, D. A.
Pastoriza, Miriani Griselda
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Dors, O. L.
Winge, C.
author_facet Krabbe, A.
Rosa, D. A.
Pastoriza, Miriani Griselda
Hägele, Guillermo Federico
Cardaci, Mónica Viviana
Dors, O. L.
Winge, C.
author_sort Krabbe, A.
title Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
title_short Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
title_full Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
title_fullStr Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
title_full_unstemmed Interaction effects on galaxy pairs with Gemini/GMOS- III: stellar population synthesis
title_sort interaction effects on galaxy pairs with gemini/gmos- iii: stellar population synthesis
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/125245
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bdutipo_str Repositorios
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