2 OPTICAL EMISSION LINE ACTIVITY CLASSIFICATION

3 LUMINOSITY CHARACTERISTICS OF THE 12MGS

4 X-RAY PROPERTIES OF THE 12MGS
4.1 Continuum
4.2 Obscuration

5 X-RAY - INFRARED RELATIONSHIP IN GALAXIES

6 DISCUSSION
6.1 X-ray properties of Seyfert galaxies
6.2 AGN selection and classification
6.3 AGN obscuration
6.4 AGN unification
6.5 Implications for the X-ray background
6.6 Implications for high redshift studies

7 CONCLUSIONS