The Baryon Fraction in the Perseus Cluster: Results from SPARTAN 1

Details The Baryon Fraction in the Perseus Cluster: Results from SPARTAN 1 The Baryon Fraction in the Perseus Cluster: Results from SPARTAN 1

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...476..479c&link_type=abstract

Astrophysical Journal v.476, p.479

Astronomy and Astrophysics

Astronomy

5

Cosmology: Dark Matter, Galaxies: Clusters: Individual Name: Perseus, X-Rays: Galaxies

Scientific paper

Spatially and spectrally resolved X-ray observations of the Perseus cluster in the 1--10 keV band were made by the Spartan 1 instrument. Analysis of the data reveals that the dark matter comprises 60% of the total mass and is concentrated toward the cluster center. This concentration may be caused by a baryonic component of the dark matter, consisting of cluster gas which has cooled. The average luminous baryon fraction within the cluster is consistent with big bang nucleosynthesis only if the cosmic mass density lies in the range 0.12 < Omega < 0.26 (H0 = 50 km s-1 Mpc-1). The total mass derived from the X-ray data is 40% of that obtained from analysis of the galaxy spatial and velocity distributions.

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