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2. THE SAMPLE

We have collected, from the literature (Table 1), the emission-line relative intensities in the spectral range 3700 Å-7000 Å for a sample of 177 nuclei of emission-line galaxies. According to the diagnostic diagrams of Baldwin, Phillips, and Terlevich (1981), the sample galaxies can be classified as Seyfert 2 (90 objects) or LINER (87), on the basis of their emission-line ratios.

TABLE 1
References For Data Used

Bonatto et al. 1989
Costero and Osterbrock 1977
Danziger et al. 1984
Diaz et al. 1988
Durret and Bergeron 1988
Filippenko and Halpern 1984
Filippenko 1985
Goodrich and Osterbrock 1983
Heckmann et al. 1980
Keel 1983
Koski 1978
Mazzarella and Balzano 1986
Phillips et al. 1983
Rose and Searle 1982
Shuder and Osterbrock 1981
Stauffer 1982
Storchi-Bergmann et al. 1990

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