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Title:
A New Measurement of the Baryonic Fraction Using the Sparse NGC 3258 Group of Galaxies
Authors:
Pedersen, Kristian; Yoshii, Yuzuru; Sommer-Larsen, Jesper
Publication:
Astrophysical Journal Letters v.485, p.L17 (ApJL Homepage)
Publication Date:
08/1997
Origin:
APJ
ApJ Keywords:
DARK MATTER, GALAXIES: INDIVIDUAL NGC NUMBER: NGC 3258, INTERGALACTIC MEDIUM, X-RAYS: GALAXIES
DOI:
10.1086/310802
Bibliographic Code:
1997ApJ...485L..17P

Abstract

New X-ray observations of the sparse NGC 3258 group of galaxies made by the ASCA satellite with good spectral and spatial resolution has revealed that this group has a gravitational potential deep enough to prohibit significant mass removal from the system. The baryonic fraction within 240 h ^{-1}50 kpc is found to be 0.065 ^{+0.051}_{-0.020} for h50 = 1, where h50 = H0/50 km s-1 Mpc-1, in good agreement with the universal value of 0.05 +/- 0.01 predicted by standard big bang nucleosynthesis for a universe with Omega 0 = 1 and h50 = 1. Since the deep potential of the NGC 3258 group ensures that all pristine intragroup gas has been retained, the baryonic fraction of the NGC 3258 group is indicative of the universal value. Consequently, it seems premature to rule out a critical universe.
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