Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.516h&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We investigate time evolution both of a rich cluster of galaxies and its member galactic halos in the standard cold dark matter (SCDM) universe, using high resolution N-body simulations. In our numerical results, we find out several hundreds of galactic halos inside of the cluster's virial radius by using the adaptive friends-of-friends algorithm. A number of halos formed at higher redshift have been tidally disrupted till z = 0 in the cluster. Therefore we improve a method of deriving merging history trees of galaxies by taking account of tidally stripped galaxies. We find that at high redshift (z > 3), the fraction of merging galaxies in the cluster formation region is higher than that of the field. After z ~3, however, it rapidly decreases. The fraction of the strongly stripped galaxies in the cluster increases with time from z ~= 0.5. At z = 0 a clear correlation appears between the fraction and the distance from the center of the cluster.
Habe Asao
Okamoto Tohru
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