Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233....1f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 1-6.
Astronomy and Astrophysics
Astrophysics
2
Baryons, Dark Matter, Galactic Clusters, Neutrinos, String Theory, Interstellar Matter, Mass Distribution, Perturbation Theory, Universe
Scientific paper
The clustering around a cosmic string loop in a universe consisting, at present, of baryons and massive neutrinos has been calculated by linear perturbation approximation. It is 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 tens of kpc, depending on the rest mass of the neutrinos. The rotation curves of such objects are remarkably flat. The amplitude 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 range of redshift 3-10.
Fang L.-Z.
Xiang Shou-Ping
Yan Lihong
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