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The structure of groups of galaxies in the Ursa Major/Canes Venatici region - I. A discussion of the results of an H I survey

1982; Oxford University Press; Volume: 201; Issue: 4 Linguagem: Inglês

10.1093/mnras/201.4.1073

1365-2966

P. N. Appleton, R. D. Davies,

Galaxies: Formation, Evolution, Phenomena

A neutral hydrogen survey has been made of galaxies in an area of ∼ 110 degree2 in Ursa Major and Canes Venatici, and the data yield many new accurate systemic velocities, H I masses and total masses. The spatial distribution and velocity structure of the area is presented and a detailed discussion is given of the global properties of the individual galaxies. This discussion lays the groundwork for an analysis of group structures which will be presented in Paper II. The results of the survey show that the Ursa Major/Canes Venatici region contains possibly four associations of galaxies identifiable both in position and velocity. For this part of the sky, any method of defining groups of galaxies based on positional information alone can be subject to serious problems because of contamination by foreground and background groups.