Mass determination of groups of galaxies: Effects of the cosmological constant

@article{Peirani2006MassDO,
  title={Mass determination of groups of galaxies: Effects of the cosmological constant},
  author={S{\'e}bastien Peirani and J. A. Freitas Pacheco},
  journal={New Astronomy},
  year={2006},
  volume={11},
  pages={325-330}
}
Abstract The spherical infall model first developed by Lemaiˆtre and Tolman was modified in order to include the effects of a dark energy term. The resulting velocity–distance relation was evaluated numerically. This equation, when fitted to actual data, permits the simultaneous evaluation of the central mass and of the Hubble parameter. Application of this relation to the Local Group, when the dark energy is modeled by a cosmological constant, yields a total mass for the M31-Milky Way pair of… Expand

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References

SHOWING 1-10 OF 35 REFERENCES
Dynamical models and the mass of the virgo cluster
Dynamical model calculations for a supercluster of galaxies are carried out, assuming spherical symmetry and ignoring two-body collisions. Observational data are analyzed for the dispersion ofExpand
The Local Group as a test of cosmological models
Abstract The dynamics of the Local Group and its environment provide a unique challenge to cosmological models. The velocity field within 5h−1 Mpc of the Local Group (LG) is extremely “cold”. TheExpand
Structure, mass and distance of the Virgo cluster from a Tolman-Bondi model
We have applied a relativistic Tolman-Bondi model of the Virgo cluster to a sample of 183 galaxies with measured distances within a radius of 8 degrees from M 87. We nd that the sample is signicantlyExpand
The infall velocity toward Virgo, the Hubble constant, and a search for motion toward the microwave background
From data on distance ratios of eight clusters and groups of galaxies in the velocity interval 800--2000 km s/sup -1/, the infall of the Local Group toward the Virgo Cluster center due to theExpand
The Local Group and Other Neighboring Galaxy Groups
Over the last few years, rapid progress has been made in distance measurements for nearby galaxies based on the magnitude of stars on the tip of the red giant branch. Current CCD surveys with theExpand
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
We present spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 " z " 0.62. The luminosity distances of these objects are determined by methods thatExpand
The signature of dark energy on the local Hubble flow
Using N-body simulations of flat, dark energy dominated cosmologies, we show that galaxies around simulated binary systems resembling the Local Group (LG) have low peculiar velocities, in goodExpand
Infall of galaxies into the virgo cluster and some cosmological constraints
A family of mass models have been developed to describe the observed infall of galaxies in the Virgo Southern Extension toward the Virgo Cluster. The requirement that the mass models also explain theExpand
The Virgo Cluster Distance from 21 Centimeter Line Widths
The distance of the Virgo cluster is derived in the B band from the 21 cm line width-absolute magnitude relation. This relation is calibrated using 18 spirals with Cepheid distances, mainly from theExpand
The angular momentum of dark haloes: merger and accretion effects
We present new results on the angular momentum evolution of dark matter haloes. Haloes, from N-body simulations, are classified according to their mass growth histories into two categories: theExpand
...
1
2
3
4
...