HYPERLEDA. II. The homogenized HI data

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, log 2V_M^{sin i}, converted to the system of Mathewson et al. (\cite{Mathewson1996}). 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{Theureau1998}); 3) the HI velocity, V_HI, expressed with the optical definition (i.e., using wavelengths instead frequencies). The typical uncertainties are: 0.04 for log 2V_M^{sin i}, 0.25 mag for m₂₁ and 9 km s^-1 for V_HI.

Full Tables \ref{epidemicw}, \ref{epidemicw2}, \ref{epidemicf}, \ref{epidemicf2} and Fig. \ref{profiles} are available in electronic form at http://www.edpsciences.org. Full Tables \ref{references}, \ref{cataf}, \ref{newdata} and \ref{notes} are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/412/57