Update on HI data collection from GBT, Parkes and Arecibo telescopes for the Cosmic Flows project

TL;DR

This paper updates the Cosmic Flows project's galaxy distance measurements by adding 4,117 new HI spectra from major radio telescopes, significantly expanding the existing catalog for improved cosmic motion mapping.

Contribution

It provides a substantial update to the HI data catalog with new measurements from archival data, enhancing the dataset for galaxy distance estimation.

Findings

Added 4,117 new HI spectra, a 34% increase.

Catalog now contains 20,343 spectra for 17,738 galaxies.

Improved data supports more accurate galaxy motion studies.

Abstract

Cosmic Flows is an international multi-element project with the goal to map motions of galaxies in the Local Universe. Kinematic information from observations in the radio HI line and photometry at optical or near-infrared bands are acquired to derive the large majority of distances that are obtained through the luminosity-linewidth or Tully-Fisher relation. This paper gathers additional observational radio data, frequently unpublished, retrieved from the archives of Green Bank, Parkes and Arecibo telescopes. Extracted HI profiles are consistently processed to produce linewidth measurements. Our current "All-Digital HI Catalog" contains a total of 20,343 HI spectra for 17,738 galaxies with 14,802 galaxies with accurate linewidth measurement useful for Tully-Fisher galaxy distances. This addition of 4,117 new measurements represents an augmentation of 34\% compared to our last release.