Galaxy pairs in cosmological simulations: Effects of interactions on star formation
We carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galax...
| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2006
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/83203 |
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I19-R120-10915-83203 |
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| 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: interactions Galaxy: formation Methods: numerical |
| spellingShingle |
Ciencias Astronómicas Cosmology: theory Galaxies: interactions Galaxy: formation Methods: numerical Perez, María Josefa Tissera, Patricia Beatriz Lambas, D. G. Scannapieco, C. Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| topic_facet |
Ciencias Astronómicas Cosmology: theory Galaxies: interactions Galaxy: formation Methods: numerical |
| description |
We carried out a statistical analysis of galaxy pairs in hydrodynamical ACDM simulations. We focus on the triggering of star formation by interactions and analysed the enhancement of star formation activity in terms of orbital parameters. By comparing the data to a suitable sample of simulated galaxies without a nearby companion, we find that close encounters (r < 30 kpc h<SUP>-1</SUP> ) may effectively induce star formation. However, our results suggest that the stability properties of systems and the spatial proximity are both relevant factors in the process of triggering star formation by tidal interactions. In order to assess the effects of projection and spurious pairs in observational samples, we constructed and analysed samples of pairs of galaxies in the simulations obtained in projection. We found a good agreement with observational results with a threshold at r<SUB>p</SUB> ∼ 25 kpc h<SUP>-1</SUP> for interactions to statistically enhance star formation activity. For pairs within r<SUB>p</SUB> < 100 kpc h<SUP>-1</SUP>, we estimated a ∼27% contamination by spurious pairs, reduced to ∼19% for close systems. We also found that spurious pairs more strongly affect high density regions, with 17% of spurious pairs detected for low density regions compared to 33% found in high density ones. We analysed the dependence of star formation on environment by defining the usual projected density parameter for both pairs and isolated galaxies in the simulations. We find the expected star formation-local density relation for both galaxies in pairs and without a close companion, with a stronger density dependence for close pairs which suggests a relevant role for interactions in driving this relation. |
| format |
Articulo Articulo |
| author |
Perez, María Josefa Tissera, Patricia Beatriz Lambas, D. G. Scannapieco, C. |
| author_facet |
Perez, María Josefa Tissera, Patricia Beatriz Lambas, D. G. Scannapieco, C. |
| author_sort |
Perez, María Josefa |
| title |
Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| title_short |
Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| title_full |
Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| title_fullStr |
Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| title_full_unstemmed |
Galaxy pairs in cosmological simulations: Effects of interactions on star formation |
| title_sort |
galaxy pairs in cosmological simulations: effects of interactions on star formation |
| publishDate |
2006 |
| url |
http://sedici.unlp.edu.ar/handle/10915/83203 |
| work_keys_str_mv |
AT perezmariajosefa galaxypairsincosmologicalsimulationseffectsofinteractionsonstarformation AT tisserapatriciabeatriz galaxypairsincosmologicalsimulationseffectsofinteractionsonstarformation AT lambasdg galaxypairsincosmologicalsimulationseffectsofinteractionsonstarformation AT scannapiecoc galaxypairsincosmologicalsimulationseffectsofinteractionsonstarformation |
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Repositorios |
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1764820488383627264 |