Clustering of Galaxies and Groups in the NOG Sample

Details Clustering of Galaxies and Groups in the NOG Sample Clustering of Galaxies and Groups in the NOG Sample

2000-10-16

arxiv.org/abs/astro-ph/0010305v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures. Contribution to "Constructing the Universe with Clusters of Galaxies", IAP 2000 meeting, Paris (France) Ju

Scientific paper

We use the two-point correlation function in redshift space, $\xi(s)$, to study the clustering of the galaxies and groups of the Nearby Optical Galaxy (NOG) Sample, which is a nearly all-sky, complete, magnitude-limited sample of \~7000 bright and nearby optical galaxies. The correlation function of galaxies is well-described by a power-law, $\xi(s)= (s/s_0)^{-\gamma}$, with $\gamma\sim1.5$ and $s_0\sim 6.4 h^{-1}$ Mpc. We find evidence of morphological segregation between early- and late-type galaxies, with a gradual decreasing of the strength of clustering from the S0 to the late-type spirals, on intermediate scales. Furthermore, luminous galaxies (with $M_B\leq -19.5 + 5 \log h$) are more clustered than dim galaxies. The groups show an excess of clustering with respect to galaxies. Groups with greater velocity dispersions, sizes, and masses are more clustered than those with lower values of these quantities.

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