The Extragalactic Distance Database: All Digital HI Profile Catalog

TL;DR

This paper presents the All Digital HI catalog within the Extragalactic Distance Database, compiling and standardizing HI line profile data from multiple sources and new observations to facilitate galaxy distance measurements.

Contribution

It introduces a comprehensive, uniformly processed catalog of HI profiles from diverse data sources, including new observations, for improved extragalactic distance studies.

Findings

Contains ~15,000 HI profiles for ~13,000 galaxies.

Provides standardized parameters like W_m50 and W_mx for galaxy rotation analysis.

Integrates data from multiple major radio telescope archives.

Abstract

An important component of the Extragalactic Distance Database (EDD) at http://edd.ifa.hawaii.edu is a group of catalogs related to the measurement of HI line profile parameters. One of these is the All Digital HI catalog which contains an amalgam of information from new data and old. The new data results from observations with Arecibo and Parkes telescopes and with the Green Bank Telescope (GBT), including continuing input since the award of the NRAO Cosmic Flows Large Program. The old data has been collected from archives, wherever available, particularly the Cornell University Digital HI Archive, the Nancay Telescope extragalactic HI archive, and the Australia Telescope archive. The catalog currently contains information on ~15,000 profiles relating to ~13,000 galaxies. The channel - flux per channel files, from whatever source, are carried through a common pipeline. The derived parameter of greatest interest is W_m50, the profile width at 50% of the mean flux. After appropriate adjustment, the parameter W_mx is derived, the linewidth which statistically approximates the peak to peak maximum rotation velocity before correction for inclination, 2 V_max sin(i).