Cosmicflows-4: The Catalog of ∼10,000 Tully–Fisher Distances
Ehsan Kourkchi, R. Brent Tully, Sarah Eftekharzadeh, Jordan Llop, Hélène M. Courtois, Daniel Guinet, Alexandra Dupuy, James D. Neill, Mark Seibert, Michael Andrews, Juana Chuang, Arash Danesh, Randy Gonzalez, Alexandria Holthaus, Amber Mokelke, Devin Schoen, Chase Urasaki
Abstract
Abstract We present the distances of 9792 spiral galaxies lying within 15,000 km s −1 using the relation between luminosity and rotation rate of spiral galaxies. The sample is dominantly, but not exclusively, drawn from galaxies detected in the course of the ALFALFA H i survey with the Arecibo Telescope. Relations between H i line widths and luminosity are calibrated at SDSS u, g, r, i, z bands and WISE W 1 and W 2 bands. By exploiting secondary parameters, particularly color indices, we address discrepancies between measured distances at different wave bands with unprecedented detail. We provide a catalog that includes reduced kinematic, photometric, and inclination parameters. We also describe a machine-learning algorithm, based on the random forest technique, that predicts the dust attenuation in spirals lacking infrared photometry. We determine a Hubble Constant value of H 0 = 75.1 ± 0.2(stat.), with potential systematics up to ±3 km s −1 Mpc −1 .