Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321l..17d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. L17-L21. Research supported b
Astronomy and Astrophysics
Astrophysics
45
Extragalactic Radio Sources, Gravitation Theory, Gravitational Lenses, Quasars, Astronomical Spectroscopy, Emission Spectra, Red Shift, Spectroscopic Analysis, Very Large Array (Vla)
Scientific paper
The discovery of an apparent quasar pair associated with radio source PKS 1145-071 is reported. The observations comprise B and V CCD images obtained at the 2.2-m telescope at ESO on December 29, 1986, 320-700-nm spectra obtained with a reticon spectrograph at the MMT on January 3-4, 1987, and radio maps (primarily at 2 cm) obtained with the C configuration of the VLA on January 9, 1987; the data are presented graphically and characterized in detail. Findings reported from the optical observations include redshift 1.345, separation 4.2 arcsec in projection, optical intensity ratio 2.5, and rest-frame redshift difference 250 + or - 100 km/s (in the strong C IV line) or 100 + or - 100 km/s (without this line) - consistent with zero. However, the fainter component is fainter by a factor of at least 500 at 2 cm than in the visible; from this it is inferred that the objects constitute a true binary quasar with a total mass of at least (10 to the 11th)/h solar mass.
Djorgovski Stanislav
McCarthy Patrick
Meylan George
Perley Rick
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