The 3a-F emulsion and the quasar redshift cut-off

Details The 3a-F emulsion and the quasar redshift cut-off The 3a-F emulsion and the quasar redshift cut-off

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asph.conf...89s&link_type=abstract

In its Astron. Phot. 1984 p 89-92 (SEE N85-16102 07-35)

Astronomy and Astrophysics

Astronomy

Astronomical Photography, Photographic Emulsions, Quasars, Red Shift, Lyman Alpha Radiation, Schmidt Cameras, Schmidt Telescopes, Spectral Sensitivity

Scientific paper

The disadvantages of searching for broad emission line objects on an emulsion whose sensitivity peaks mimic those emission features are outlined. The IIIa-F emulsion was used with UK Schmidt telescope plates to find high red shift quasars (z3). Far fewer objects than expected from extrapolations of low red shift data were found, since the Lyman alpha emission feature of the high red shift quasar is not as prominent as that for low shift due to the irregular sensitivity response of the emulsion. A 4 m telescope, IIIa-F survey also failed to find the expected number of high red shift quasars. The emission lines used to identify the objects are near the sensitivity peaks of the emulsion, and no objects are detected where emulsion sensitivity drops by 0.5 mag (6000 to 6500 A).

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