The H3 Stellar Spectroscopic Survey

The H3 Survey is answering the question: how did the Milky Way Galaxy grow and assemble over cosmic time? To answer this question, a group of scientists at the CfA and the University of Arizona are mapping the outer limits of the Galaxy with >200,000 stars observed with the 6.5m MMT telescope in Arizona.

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Science Goals

The H3 Survey will unravel the assembly history of the Galaxy by addressing the following key science questions:

Identify and characterize disrupting and disrupted dwarf galaxies in the Milky Way stellar halo using both phase space information and chemistry.
Measure the outer mass profile of the Galaxy and the shape of the dark matter halo.
Understand the transition between the thick stellar disk and the stellar halo.

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The H3 Stellar Spectroscopic Survey

Scientists