The First H I-Discovered Galaxy in the Bootes Void

Abstract

In this paper we present a detailed study of the first H I-discovered galaxy in the Bootes void, at a distance of 145.5 Mpc. We have observed this galaxy both at low and high resolution in the 21 cm line and optically. The galaxy has an irregular, slowly rotating H i disk. The gas is much more extended than the optical disk, extending out as far as 6.4 times R25. The rotation curve of the galaxy is flat: amplitude and shape can be explained by the presence of a dark halo with a mass of 1.6 times the luminous mass