HYPERLEDA^*

II. The homogenized HI data

¹ Observatoire de Lyon, avenue Charles-André, 69561 Saint-Genis Laval Cedex, France
² LPCE, CNRS-Orléans, 3A avenue de la recherche scientifique, 45071 Orléans Cedex 02, France
³ Observatoire de Paris-Meudon, GEPI, 5 place Jules Janssen, 92195 Meudon Cedex, France
⁴ Université Paris-Sud, Bât. 470, 15 rue Georges Clémenceau, 91405 Orsay Cedex, France

Corresponding author: G. Paturel, patu@obs.univ-lyon1.fr

Received: 25 March 2003
Accepted: 29 July 2003

Abstract

After a compilation of HI data from 611 references and new observations made in Nançay, we produce a catalog of homogenized HI data for 16781 galaxies. The homogenization is made using the EPIDEMIC method from which all data are progressively converted into the adopted standard. The result is a catalog giving: 1) the logarithm of twice the maximum rotation velocity, , converted to the system of Mathewson et al. ([CITE]). This quantity is given without correction for inclination; 2) the HI magnitude, m₂₁, (area of the 21-cm line width expressed in magnitude) converted to the flux system of Theureau et al. ([CITE]); 3) the HI velocity, V_HI, expressed with the optical definition (i.e., using wavelengths instead frequencies). The typical uncertainties are: 0.04 for , 0.25 mag for m₂₁ and 9 km s^-1 for V_HI.