An extragalactic data base. II - The HI data

Details An extragalactic data base. II - The HI data An extragalactic data base. II - The HI data

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26as...82..391b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 82, no. 3, March 1990, p. 391-488. Research supported by the

Statistics

Computation

166

Astronomical Catalogs, Data Bases, Galaxies, Radio Spectra, Computational Astrophysics, Radial Velocity, Spectral Line Width

Scientific paper

A compilation of raw H I data has been made as a part of a big project of collecting astrophysical parameters for more than 70000 galaxies. Corrections to produce homogenized H I parameters are deduced from the compilation made for the Extragalactic Data Base. All raw 21-cm line widths are reduced to a common system of widths at 20 percent and 50 percent of the peak. They are corrected for velocity resolution effect and tested for homogeneity reference by reference. The H I fluxes converted to uniform units system are corrected, when necessary, for beam-filling effect. The homogenized mean fluxes are tested for scale and zero-point errors and also for a reference effect. Heliocentric H I-velocities are reduced in the same way. These results have been used to produce a catalogue of weighted mean H I parameters for 6439 galaxies.

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