Orientation of first-ranked galaxies in rich clusters

Details Orientation of first-ranked galaxies in rich clusters Orientation of first-ranked galaxies in rich clusters

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..201r&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

8

Disk Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure

Scientific paper

New evidence is presented to show that first-ranked galaxies are aligned with their parent cluster and with the direction of the nearest neighbor cluster (scale 15/h Mpc). The effect is stronger for cD and gE galaxies than for first-ranked galaxies of later type. The relevance of this result for different galaxy formation scenaries is discussed. In hierarchical clustering scenarios like the cold dark matter theory, galactic halos and clusters of galaxies are expected to have moderate asphericity. Some numerical results of an ongoing study of the dissipationless collapse of moderately aspherical systems are presented. The results indicate that the central part of the collapsed and virialized system does show the large scale elongation imposed by the initial conditions. It is pointed out that this may have important implications also for the properties of disk galaxies in dark halos.

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