The ursa major cluster of galaxies - IV. HI synthesis observations

In this data paper we present the results of an extensive 21 cm-line synthe sis imaging survey of 43 spiral galaxies in the nearby Ursa Major cluster u sing the Westerbork Synthesis Radio Telescope. Detailed kinematic informati on in the form of position-velocity diagrams and rotation curves is present ed in an atlas together with HI channel maps, 21 cm continuum maps, global HI profiles, radial HI surface density profiles, integrated HI column densi ty maps, and HI velocity fields. The relation between the corrected global HI linewidth and the rotational velocities V-max and V-flat as derived from the rotation curves is investigated. Inclination angles obtained from the optical axis ratios are compared to those derived from the inclined HI disk s and the HI velocity fields. The galaxies were not selected on the basis o f their HI content but solely on the basis of their cluster membership and inclination which should be suitable for a kinematic analysis. The observed galaxies provide a well-defined, volume limited and equidistant sample, us eful to investigate in detail the statistical properties of the Tully-Fishe r relation and the dark matter halos around them.