The Observational Mass Function of Loose Galaxy Groups

@article{Girardi2000TheOM,
  title={The Observational Mass Function of Loose Galaxy Groups},
  author={Marisa Girardi and G. Lanzafame Dipartimento di Fisica e Astronomia and Universita di UdineI.N.F.N. Trieste and Trieste and Italy Sissa and Italy.},
  journal={The Astrophysical Journal},
  year={2000},
  volume={540},
  pages={45-56}
}
We analyze the three catalogs of nearby loose groups compiled by A. M. Garcia. She identified groups in a magnitude-limited redshift galaxy catalog, which covers about ~ of sky within cz = 5500 km s-1, using two methods, a percolation method and a hierarchical method. The free parameters of the group-selection algorithms were tuned to obtain similar catalogs of groups. The author also proposed a third catalog of groups, defined as a combination of the two. Each catalog contains almost 500… 

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References

SHOWING 1-10 OF 68 REFERENCES
Assessing the Accuracy of Masses and Spatial Correlations of Galaxy Groups
Two algorithms for the identification of galaxy groups from redshift surveys are tested by application to simulated data derived from N-body simulation. The accuracy of the membership assignments by
Clustering of galaxies in a hierarchical universe — III. Mock redshift surveys
This is the third paper in a series which combines N-body simulations and semi-analytic modelling to provide a fully spatially resolved simulation of the galaxy formation and clustering processes.
Nearby Optical Galaxies: Selection of the Sample and Identification of Groups
In this paper we describe the Nearby Optical Galaxy (NOG) sample, which is a complete, distance-limited (cz ≤ 6000 km s-1) and magnitude-limited (B ≤ 14) sample of ~7000 optical galaxies. The sample
The redshift-space neighborhoods of 36 loose groups. 2: Analysis
We explore the kinematics of 36 rich RGH89 groups identified from the first two complete slices of the CfA redshift survey. These groups have more than five members identified by a friends-of-friends
Groups of galaxies. III. the CfA survey
We present a statistically homogeneous group catalog (CfA) based on the CfA redshift survey (Huchra et al.). Groups in the catalog are all density enhancements in redshift space of a factor greater
Nearby groups of galaxies. I. The NGC 1023 group.
New H I radial velocities of galaxies have been acquired in a large region around NGC 023. Hierarchical clustering techniques have been developed as a means to describe the clustering properties of
The Properties of Poor Groups of Galaxies. I. Spectroscopic Survey and Results
We use multifiber spectroscopy of 12 poor groups of galaxies to address (1) whether the groups are bound systems or chance projections of galaxies along the line of sight; (2) why the members of each
Optical mass estimates of galaxy clusters
We evaluate in a homogeneous way the optical masses of 170 nearby clusters (z ≤ 0.15). The sample includes both data from the literature and the new ESO Nearby Abell Clusters Survey (ENACS) data. On
Properties of galaxy clusters: mass and correlation functions
We analyse parallel N-body simulations of three Cold Dark Matter (CDM) universes to study the abundance and clustering of galaxy clusters. The simulation boxes are 500h 1 Mpc on a side and cover a
The Observational Mass Function of Nearby Galaxy Clusters
We present a new determination of the mass function of galaxy clusters, based on optical virial mass estimates for a large sample of 152 nearby (z ? 0.15) Abell-ACO clusters, as provided by Girardi
...
1
2
3
4
5
...