Toward Cosmicflows-4: The \hi data catalog

TL;DR

This paper updates the HI data catalog with new and reprocessed measurements, providing essential data for galaxy distance estimation via the Tully-Fisher relation, supporting the Cosmicflows-4 project.

Contribution

It presents an expanded, high-quality HI data catalog with 1,274 new measurements, integrating observations and archival data for improved galaxy distance calculations.

Findings

Added 1,274 new HI measurements to the catalog.

Catalog now contains 18,874 galaxies with 15,433 suitable for Tully-Fisher analysis.

Enhanced data quality supports more accurate galaxy distance and velocity studies.

Abstract

In this study, we present an update of a compilation of line width measurements of neutral atomic hydrogen (HI) galaxy spectra at 21 cm wavelength. Our All Digital HI (ADHI) catalog consists of the previous release augmented with our new HI observations and an analysis of archival data. This study provides the required HI information to measure the distances of spiral galaxies through the application of the Tully-Fisher (TF) relation. We conducted observations at the Green Bank telescope (GBT) and reprocessed spectra obtained at the Nancay radiotelescope by the Nancay Interstellar Baryons Legacy Extragalactic Survey (NIBLES) and Kinematics of the Local Universe (KLUN) collaborations and we analyzed the recently published full completion Arecibo Legacy Fast ALFA (ALFALFA) 100% survey in order to identify galaxies with good quality HI line width measurements. This paper adds new HI data adequate for TF use for 385 galaxies observed at GBT, 889 galaxies from archival Nancay spectra, and 1,515 rescaled Arecibo ALFALFA spectra. In total, this release adds 1,274 new good quality measurements to the ADHI catalog. Today, the ADHI database contains 18,874 galaxies, for which 15,433 have good quality data for TF use. The final goal is to compute accurate distances to spiral galaxies, which will be included in the next generation of peculiar velocities catalog: Cosmicflows-4.