From FNAL- “Frontier Science Result: DES Reticulum II: Welcome to the neighborhood”

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April 17, 2015
Alex Drlica-Wagner

1This plot shows the positions of stars surrounding the newly discovered dwarf galaxy Reticulum II. Points outlined in black represent stars for which high-resolution optical spectra provided velocity measurements. Red points represent stars that were confirmed to be members of the new dwarf galaxy, while gray points are non-members. (Points that are not outlined do not have velocity measurements.)

The number of dark matter-dominated Milky Way satellite dwarf galaxies was increased by one this week. Scientists discovered the newest dwarf galaxy, Reticulum II, in data from the Dark Energy Survey.

Dark Energy Survey
Dark Energy Camera
DES and DECam, the camera built at FNAL

However, the DES data alone were not enough to confirm that Reticulum II was indeed a dark matter-dominated dwarf galaxy. Determining the dark matter content of Reticulum II required…

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One Response to From FNAL- “Frontier Science Result: DES Reticulum II: Welcome to the neighborhood”

  1. I appreciate the reblog. Thanks.

    Like

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