Cosmicflows-4: The Baryonic Tully-Fisher Relation Providing ~10,000 Distances

Understand

The interstellar gas in spiral galaxies can constitute a significant fraction of the baryon mass and it has been demonstrated that the sum of stellar and gas components correlates well with the kinematic signature of the total mass content, the widths of HI line profiles.

• The correlation of baryonic mass with HI line widths is used here to obtain distances for 9984 galaxies extending to ~0.05c.
• The sample is HI flux limited and a correction is required to account for an HI selection bias.
• The absolute scale is established by 64 galaxies with known distances from studies of Cepheid variables and/or the magnitudes of stars at the tip of the red giant branch.