A wide-angle objective prism survey for bright quasars.

Details A wide-angle objective prism survey for bright quasars. A wide-angle objective prism survey for bright quasars.

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990msngr..60...13r&link_type=abstract

The Messenger, vol. 60, p. 13-15

Physics

16

Quasars: Surveys, Quasars: Spectra

Scientific paper

Quasars are the most luminous objects in the universe which - not to speak about a growing interest in understanding these luminous active nuclei of galaxies themselves - can be used as light sources that probe the intervening matter at large cosmic distances early in the history of the universe. However, the number of known QSOs, in particular at high redshifts, which are sufficiently bright for detailed follow-up observations is extremely small. So, e.g., although several thousand QSOs are known at present, the only high-redshift QSO sufficiently bright for the shortwavelength camera of the IUE satellite, and as such a prime (accepted) target for the Hubble Space Telescope, was discovered only in 1988 by the Hamburg Quasar Survey with the Calar Alto Schmidt (HS 1700 + 6416, V = 16.1, z = 2.72, Reimers et al., 1989).

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