From Keck: “The Dark Matter Conspiracy”

Science Springs

Keck Observatory

Keck Observatory

Keck Observatory

April 29, 2015
MEDIA CONTACT
Steve Jefferson
W. M. Keck Observatory
sjefferson@keck.hawaii.edu
808.881.3827

1Example of mapping out and analyzing the speeds of stars in an elliptical galaxy. Blue colors show regions where the stars are hurtling toward the observer on Earth, and red colors show regions that are moving away, in an overall pattern of coherent rotation. The top panel shows the original data, as collected using the DEIMOS spectrograph at the W.M. Keck Observatory. The bottom panel shows a numerical model that matches the data remarkably well, from using the combined gravitational influence of luminous and dark matter. Credit: M. Cappellari and the SLUGGS team

2The speeds of stars on circular orbits have been measured around both spiral and elliptical galaxies. Without dark matter, the speeds should decrease with distance from the galaxy, at different rates for the two galaxy types. Instead, the dark matter appears to…

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