Physics – Optics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...92...33e&link_type=abstract
The Astrophysical Journal Supplement Series, vol. 92, no. 1, p. 33-52
Physics
Optics
46
Active Galactic Nuclei, Astronomical Catalogs, Astronomical Photometry, Astronomical Spectroscopy, Distance, Galactic Clusters, Quasars, Red Shift, Apertures, Cassegrain Optics, Charge Coupled Devices, Data Reduction, Telescopes
Scientific paper
A catalog of photometric and spectroscopic observations of faint galaxies in the fields of seven quasars with 0.4 less than z less than 0.6 is presented. The quasar sample was chosen based on previous imaging results indicating that they are situated in clusters of galaxies of Abell richness class 1 or greater. The observations were made using the MARLIN/LAMA multiobject spectroscopic system at the Canada-France-Hawaii Telescope. The data include photometry of all objects in fields of approximately 6 x 4 min around each quasar with completeness limits of approximately 23.5 mag in both Gunn r and g. The total defined field size is 143 arcmin2. Low-resolution spectra of 388 objects were obtained, yielding a total of 234 redshifts in these fields with z up to approximately 0.7. Of these, 64 are considered to be associated with the quasars. Completeness limits for successful spectroscopic identification of galaxies in the defined field are 78% for those galaxies brighter than r = 21,5 mag observed spectroscopically, and 49% overall. Subsequent papers will address the physical properties of the cluster galaxies associated with quasars, and of the field galaxies.
Ellingson Erica E.
Yee Howard K. C.
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