Velocity Map of Andromeda Stars (IMAGE)

University of California - Santa Cruz

Velocity Map of Andromeda Stars

Caption

Dots show locations of stars in the spectroscopic survey superimposed on an image of the Andromeda galaxy (M31). Dots are color coded according to their velocity relative to the Milky Way, as measured using the DEIMOS spectrograph on the Keck II telescope. The center of M31 is moving towards us at 300 km/s, whereas stars to the northeast of the center have more positive velocities, indicating that they are moving away from us relative to M31's center.

Credit

Claire Dormanm European Space Agency

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