Emission-line galaxies in the Virgo region

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Dwarf Galaxies, Emission Spectra, Spectral Line Width, Virgo Galactic Cluster, Compact Galaxies, H Ii Regions, Luminosity, Spatial Distribution, Star Formation

Scientific paper

Spectroscopic observations, obtained at 490-690 nm using a grism spectrograph with a 1.4-arcsec-wide slit and a CCD detector (dispersion 4 A/pixel at scale 0.68 arcsec/pixel) on the 88-inch University of Hawaii telescope on March 22-24, 1983, are reported for five emission-line galaxies identified in a search for quasars on UK Schmidt Telescope plates of the Virgo region (He et al., 1984). The data are presented in tables, spectra, and line-ratio plots and characterized. The systems are found to have M(V) from -19 to -14, strong narrow lines of large equivalent width, and no evidence of power-law excitation or broad line components, and are classified as compact metal-poor extragalactic H II regions or blue compact dwarf galaxies. Three of the galaxies (EG4, HII2, and OEG1) are shown to be members of the Virgo cluster.

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