Two variable quasars at z<4

Details Two variable quasars at z<4 Two variable quasars at z<4

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280l...1h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 1, pp. L1-L4.

Astronomy and Astrophysics

Astronomy

Quasars: General

Scientific paper

In this paper we report the discovery of two quasars with redshifts z=4.20 and 4.36 on the basis of optical variability. The quasars were found from digital stacks of a set of about 200 Schmidt telescope plates, which were subdivided into yearly sub-stacks of four plates covering 12 years, giving a limiting magnitude of R=21. The advantages of this technique are discussed, and the properties of the quasars are compared with those found by other methods.

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