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The center of the Eridanus Cluster is roughly from Earth, and contains about 73 main galaxies and about 200 total galaxies. About 30% have Hubble classifications of elliptical or S0 and the remaining 70% are spiral or irregular. These galaxies reside in smaller groups which are all loosely gravitationally bound to each other, suggesting that the system is still condensing from the Hubble flow and may eventually form a cluster of about 1014 . A low velocity dispersion compared to that of, for example, the Coma cluster, supports this hypothesis.〔 The Eridanus Cluster is located in the constellation Eridanus near the Fornax Cluster, and is sometimes called the "Fornax II Cluster".〔 ==Table of galaxies== Column 1: Name of the galaxy Column 2: Right ascension for epoch J2000 Column 3: Declination for epoch J2000 Column 4: Blue apparent magnitude of the galaxy Column 5: Galaxy type: E=Elliptical; S0=Lenticular; Sa, Sb, Sc, Sd=Spiral; SBa, SBb, SBc, SBd=Barred Spiral; Sm, SBm, Irr=Irregular Column 6: Angular diameter of the galaxy (arcminutes) Column 7: Diameter of the galaxy (thousands of light years) Column 8: Recessional velocity (km/s) of the galaxy relative to the cosmic microwave background 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eridanus Cluster」の詳細全文を読む スポンサード リンク
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