Discovery of DHM0054-284 - A quasar of redshift 3.61

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Quasars, Red Shift, Astronomical Photography, Schmidt Telescopes, Spectrum Analysis

Scientific paper

The paper reports the discovery of a quasar of redshift 3.61 detected in a broad band survey of stars using COSMOS measurements of UK Schmidt Telescope (UKST) photographs. The identification of the object as a quasar was confirmed by spectroscopic observations made with the Anglo-Australian Telescope (AAT). The quasar's redshift is the second highest so far detected and the highest for a quasar discovered using purely optical techniques. The search for DHM0054-284 is described and it is suggested that the methods provide an efficient way of finding more high-redshift quasars.

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