An HI survey of the Bootes Void. I. The Data

Abstract

We present the results of a neutral hydrogen survey of the Bootes void carried out with the VLA in D-array. The survey covers $\sim 1100$ Mpc${}^3$, about 1\% of the volume of the void as defined by Kirshner \etal 1987. We observed 24 fields, centered on known void galaxies; 16 of these were detected in HI. Eighteen uncataloged companion galaxies were discovered directly in the HI line at distances of $45\sec$ to $14.5\min$ 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 $\sim 1\min$ (45 kpc) \footnote{Throughout this paper, we have assumed $H_0$ = $100\mathrm{km}{\mathrm{s}}^{-1}\mathrm{Mp}{\mathrm{c}}^{-1}$.}, each field has a size of $\sim 1°$ (2.7 Mpc). The detected HI masses range from $8\times 10^8$ to $1\times 10^{10} \msol$. Typically our $2\sigma$ HI column density sensitivity is $2\times 10^{19}\mathrm{c}{\mathrm{m}}^{-2}$. The radio and optical data are analyzed and discussed in the following companion article (Paper~2, Szomoru, van Gorkom, Gregg and Strauss 1996).

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

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