Biased Clustering in a Universe with Hot Dark Matter and Cosmic String

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Astron.Astrophys.

OSTI ID:2997668

Fang, Li-Zhi ^[1]; Xiang, Shou-Ping ^[2]; Yan, Lin ^[2]

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1. Beijing Observ.
2. Hefei, CUST

The clustering around a cosmic string loop in an universe consisting, at present, of baryons and massive neutrinos have been calculated in linear perturbation approximation, ~e pay attention mainly on the bias in the clustering. It has been shown that the biased clustering of baryons started Just after the decoupling time; the clustering will form an object with structure of a core dominated by baryons in the inner region and a halo dominated by massive neutrinos in the outer region. The present length scale of the cores is about several decades Kpc, depending on the rest mass of neutrinos. The rotation curves of such objects are remarkable flat. The amplitudes of the rotation curves decreases with cosmic time. Comparing the observed rotation velocities with calculated results, it is found that galaxies would be formed in the period of redshift z :>' 3 - 10. The maximum length scale of the bias is about the same as for clusters of galaxies. This result seems to be useful to explain the correlation between the features of rotation curves of cluster galaxies and the galaxy's distance from the center of the cluster.

• Research Organization: Hefei, CUST; Beijing Observ.
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2997668
• Report Number(s): FERMILAB-PUB-90-023-A; oai:inspirehep.net:294595
• Journal Information: Astron.Astrophys., Journal Name: Astron.Astrophys. Vol. 233
• Country of Publication: United States
• Language: English