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The Origin of Galaxy Bimodality

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<strong>The</strong> Bi-Modal Distribution <strong>of</strong> Galaxies<br />

Early-Type<br />

Spheroidal Morphology<br />

Old Stellar Populations<br />

No or Little Cold Gas<br />

Red Colors<br />

Late-Type<br />

What is the origin <strong>of</strong> this bimodality?<br />

Disk-Like Morphology<br />

Young Stellar Populations<br />

Abundant Cold Gas<br />

Blue colors<br />

Frank van den Bosch University <strong>of</strong> Utah

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