We present the results of a neutral hydrogen survey of the Bootes void carried out with the VLA [Napier et al., Proc. Inst. Electron. Electric. Eng. 71, 1295 (1983)] in D array. The survey covers ~1100 Mpc^3^, about 1% of the volume of the void as defined by Kirshner et al., [ApJ, 314,493(1987)]. We observed 24 fields, centered on known void galaxies; 16 of these were detected in H I. Eighteen uncataloged companion galaxies were discovered directly in the H I line at distances of 45" to 14.5' from the target galaxies. We also present the results of follow-up optical imaging observations and discovery of one additional Bootes void galaxy, found through spectroscopy of a number of apparent companions to known void members. Our angular resolution is ~1' (45 kpc)^3^ each field has a size of ~1^deg^ (2.7 Mpc). The detected H I masses range from 8 x 10^8^ to 1 x 10^10^ M_sun_. Typically our 2σ HI column density sensitivity is 2 x 10^19^ cm^-2^. The radio and optical data are analyzed and discussed in the following companion article (Paper 11, Szomoru et al. 1996).
The Astronomical Journal
- Pub Date:
- June 1996
- LARGE-SCALE STRUCTURE OF THE UNIVERSE;
- Latex file of abstract. The postscript version of the complete paper (1.1 Mb in gzipped format) including all the figures can be retrieved from http://www.astro.rug.nl:80/~secr/ To appear in the February 1996 issue of the Astronomical Journal