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We describe the results of an ecient survey to identify bright B < 18 active galactic nuclei (AGN) within 4 (4.7 h 1 Mpc projected radius) of the cen- tre of the Coma cluster of galaxies. The candidates have been carefully selected either as unresolved UV-excess ob- jects with no detected proper motion, or from identi- cations on objective-prism plates including a few ROSAT sources. A global success rate larger than 30% is achieved. Low-resolution spectra are presented for the extragalactic objects identied in the course of the survey: the sample contains 16 emission-line objects, a BL Lac candidate and an elliptical galaxy. The AGNs of this list are unique tar- gets to study the association of the Lyman- forest with large-scale structures and galactic haloes at low redshift, to search for warm gas within the Coma cluster and nearby laments, and for optical monitoring to detect the micro- lensing variability produced by the baryonic dark matter in the cluster.

Identification of active galaxies behind the Coma cluster of galaxies