Cosmicflows-2: The Data

Understand

Cosmicflows-2 is a compilation of distances and peculiar velocities for over 8000 galaxies.

• Numerically the largest contributions come from the luminosity-linewidth correlation for spirals, the TFR, and the related Fundamental Plane relation for E/S0 systems, but over 1000 distances are contributed by methods that provide more accurate individual distances: Cepheid, Tip of the Red Giant Branch, Surface Brightness Fluctuation, SNIa, and several miscellaneous but accurate procedures.
• Our collaboration is making important contributions to two of these inputs: Tip of the Red Giant Branch and TFR.
• A large body of new distance material is presented.