TITLE: 

A Search for Galaxies with a Variable Nucleus

AUTHORS:

Trevese, D., Bershady, M. A., Kron, R. G. 

PUBLISHED:

to appear in proceedings of "ESO/IAC Workshop on Quasar Hosts,"
(Puerto de la Cruz, Tenerife, Spain)

ABSTRACT:

We have selected a sample of candidate AGNs with extended images on
the basis of variability, to B=22.5 in Selected Area 57. Most of the
objects have colors typical of AGNs. The brightest three of them have
been observed spectroscopically and show emission lines typical of
Seyfert I galaxies.  Variability, as a detection criterion, allows us
to fill a region of the redshift-luminosity plane containing
intrinsically faint QSOs or high redshift Seyfert I galaxies.