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NGC 1407: Center of a Dark, Massive Cluster?

Evidence is presented that Eridanus A, a cluster of galaxies centered on NGC 1407, has a mass-to-light ratio, M/L B ∼3000 h, making it one of the darkest known clusters. Eridanus A contains only two bright galaxies, NGC 1407 and NGC 1400, and is circumscribed within ∼200 h −1 kpc, yet based on reasonable assumptions, it has a virial mass ∼7×10 13 M ○ . h −1 . The high mass and high M/L estimates rest heavily on the supposition that NGC 1400, which has a peculiar velocity ∼1100 km s −1 ,is truly a cluster member and not a foreground object