Emission-line galaxies in the Bootes void

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Abstract

The observation of three new Boo void emission-line galaxies (ELGs) in a 460-550-nm 4.5-deg prism survey, medium-dispersion spectra, and direct CCD R imagery is reported. The data are presented in tables, spectra, and isophotal maps along with data on five previously discovered Boo void ELGs. Six of the eight galaxies are shown to be similar to H II regions, with irregular morphologies, narrow lines, weak stellar continua, and diameters of about 10/h kpc; the other two are I Zw 81 (with a well-defined nucleus) and the Seyfert 1 spiral Mrk 845. The galaxy density of the void is estimated as no less than 10 percent of the cosmic mean galaxy density, and it is suggested that the fraction of ELGs in this region may be elevated.

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