Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-10
Astronomy and Astrophysics
Astrophysics
44 pages, 21 figures (17 included). Submitted to New Astronomy. GIFF color plots and the complete paper in Postscript (includi
Scientific paper
10.1016/S1384-1076(99)00006-8
Using N-body+hydro simulations we study relations between the local environments of galaxies on 0.5 Mpc scale and properties of the luminous components of galaxies. Our numerical simulations include effects of star formation and supernova feedback in different cosmological scenarios: the standard Cold Dark Matter model, the Broken Scale Invariance model (BSI), and a model with cosmological constant (LCDM). In this paper, we concentrate on the effects of environment on colors and morphologies of galaxies, on the star formation rate and on the relation between the total luminosity of a galaxy and its circular velocity. We demonstrate a statistically significant theoretical relationship between morphology and environment. In particular, there is a strong tendency for high-mass galaxies and for elliptical galaxies to form in denser environments, in agreement with observations. We find that in models with denser environments (CDM scenario) ~ 13 % of the galactic halos can be identified as field ellipticals, according to their colors. In simulations with less clustering (BSI and LCDM), the fraction of ellipticals is considerably lower (~ 2-3 %). The strong sensitivity of morphological type to environment is rather remarkable because our results are applicable to ``field'' galaxies and small groups. If all galaxies in our simulations are included, we find a statistically significant dependence of the galaxy luminosity - circular velocity relation on dark matter overdensity within spheres of radius 0.5 Mpc, for the CDM simulations. But if we remove ``elliptical'' galaxies from our analysis to mimic the Tully-Fisher relation for spirals, then no dependence is found in any model.
Elizondo D.
Kates Ron
Klypin Anatoly
Yepes Gustavo
No associations
LandOfFree
Hydrodynamical simulations of galaxy properties: Environmental effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Hydrodynamical simulations of galaxy properties: Environmental effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrodynamical simulations of galaxy properties: Environmental effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-229998