Identification of active galaxies behind the Coma cluster of galaxies

Details Identification of active galaxies behind the Coma cluster of galaxies Identification of active galaxies behind the Coma cluster of galaxies

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..109l&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.109-117

Astronomy and Astrophysics

Astrophysics

2

Quasars: General, Quasars: Absorption Lines, Galaxies: Seyfert, Galaxies: Starburst, Techniques: Spectroscopic, Surveys

Scientific paper

We describe the results of an efficient survey to identify bright B<~ 18 active galactic nuclei (AGN) within ~ 4degr (4.7 h(-1) Mpc projected radius) of the centre of the Coma cluster of galaxies. The candidates have been carefully selected either as unresolved UV-excess objects with no detected proper motion, or from identifications 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 identified 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 targets to study the association of the Lyman-alpha forest with large-scale structures and galactic haloes at low redshift, to search for warm gas within the Coma cluster and nearby filaments, and for optical monitoring to detect the micro-lensing variability produced by the baryonic dark matter in the cluster. Based on observations carried out at the 1.93 m telescope of the Observatoire de Haute-Provence (CNRS), France.

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