The discovery of an X-ray selected, radio-loud quasar at Z = 3.9

Details The discovery of an X-ray selected, radio-loud quasar at Z = 3.9 The discovery of an X-ray selected, radio-loud quasar at Z = 3.9

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..531b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 531-534.

Astronomy and Astrophysics

Astronomy

21

Active Galaxies, Quasars, X Ray Sources, Astronomical Spectroscopy, Emission Spectra, Heao 2, Northern Sky, Proportional Counters, Red Shift, Very Large Array (Vla)

Scientific paper

About 600 weak X-ray sources from a data base of about 100,000 2-4sigma fluctuations derived from Einstein Observatory imaging proportional counter X-ray images are selected on the basis of a flux-limited catalog of radio sources in the northern sky. Optical spectroscopy of only six of these sources resulted in the discovery of a quasar with an emission-line redshift of 3.87. Subsequent VLA observations reveal the source to have a flat-spectrum radio core plus an unresolved radio lobe 2.5 arcsec away with a spectral index of 1.45. The lobe is connected to the core by a weak jet. The integrated flux density of the source at 20 cm is 0.66 Jy. The v magnitude of the quasar is 19.5, and the tentative X-ray sources has a very soft spectrum. The properties of this object are discussed in the context of known high-redshift radio sources and existing X-ray selected quasar samples, and the potential of the present discovery technique for examining the properties of very distant active galaxies is explored.

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