Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45l..13m&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 2, p. L13-L19.
Astronomy and Astrophysics
Astronomy
3
Baryons, Big Bang Cosmology, Cosmic Gases, Galactic Clusters, Space Density, X Ray Sources, Galactic Structure, Nuclear Fusion
Scientific paper
We estimated the X-ray gas mass of the clusters in the Shapley Supercluster by improving a previous estimate based on the extrapolation from the Coma data. Our estimate of the X-ray gas mass in the Shapley Supercluster, which depends on h50 and beta (a power-law index characterizing the gas density profile around a cluster), turned out to be a factor of 2-4 times smaller than the previous value. We then considered its implication on the baryon density parameter in the universe. Our estimates from the the Shapley Supercluster region are consistent with the predicted range according to the standard big-bang nucleosynthesis model if the universe is open for h50 = 2.0, or if the universe is flat (Omega(0) = 1.0), but with a substantial fraction of (non-baryonic) dark matter existing in intercluster space for h50 = 1.0.
Makino Nobuyoshi
Suto Yasushi
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