Galaxy pairs in cosmological simulations: Effects of interactions on star formation

M. J. Perez, P. B. Tissera, D. G. Lambas, C. Scannapieco

Resultado de la investigación: Article

22 Citas (Scopus)

Resumen

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 -1 ) 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 rp ∼ 25 kpc h -1 for interactions to statistically enhance star formation activity. For pairs within rp < 100 kpc h-1, 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, j

Idioma originalEnglish
Páginas (desde-hasta)23-32
Número de páginas10
PublicaciónAstronomy and Astrophysics
Volumen449
N.º1
DOI
EstadoPublished - 1 abr 2006

Huella dactilar

star formation
galaxies
simulation
interactions
density dependence
projection
statistical analysis
effect
encounters
proximity
contamination
orbitals
thresholds
augmentation
parameter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Perez, M. J. ; Tissera, P. B. ; Lambas, D. G. ; Scannapieco, C. / Galaxy pairs in cosmological simulations : Effects of interactions on star formation. En: Astronomy and Astrophysics. 2006 ; Vol. 449, N.º 1. pp. 23-32.
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Galaxy pairs in cosmological simulations : Effects of interactions on star formation. / Perez, M. J.; Tissera, P. B.; Lambas, D. G.; Scannapieco, C.

En: Astronomy and Astrophysics, Vol. 449, N.º 1, 01.04.2006, p. 23-32.

Resultado de la investigación: Article

TY - JOUR

T1 - Galaxy pairs in cosmological simulations

T2 - Effects of interactions on star formation

AU - Perez, M. J.

AU - Tissera, P. B.

AU - Lambas, D. G.

AU - Scannapieco, C.

PY - 2006/4/1

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N2 - 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 -1 ) 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 rp ∼ 25 kpc h -1 for interactions to statistically enhance star formation activity. For pairs within rp < 100 kpc h-1, 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, j

AB - 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 -1 ) 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 rp ∼ 25 kpc h -1 for interactions to statistically enhance star formation activity. For pairs within rp < 100 kpc h-1, 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, j

KW - Cosmology: theory

KW - Galaxies: interactions

KW - Galaxy: formation

KW - Methods: numerical

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