A search for dark clusters in redshift catalogs

Details A search for dark clusters in redshift catalogs A search for dark clusters in redshift catalogs

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..417d&link_type=abstract

In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19

Statistics

Computation

Astronomical Catalogs, Dark Matter, Galactic Clusters, Red Shift, Computational Astrophysics, Gravitational Effects, X Ray Spectra

Scientific paper

In this work an attempt is made to set limits on the abundance of 'dark clusters' (i.e., deep gravitational potential wells similar to those in clusters of galaxies but without the galaxies). Two methods based on statistics of galaxy velocities in redshift surveys are discussed. Both methods turn up some objects which look like groups but with large velocity dispersions (more than 1000 km/s). Some of these may be larger scale structures seen in projection, while others are compact groups which seem to be bound. Until the statistics of these objects are sorted out we cannot put a reliable upper limit on the density of cluster-like potential minima. Meanwhile, some of the objects which stand out in the analysis warrant further observational study.

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