Mathematics – Probability
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.323..784h&link_type=abstract
Nature (ISSN 0028-0836), vol. 323, Oct. 30, 1986, p. 784-786. Research supported by the Smithsonian Institution.
Mathematics
Probability
9
Gravitational Lenses, Quasars, Ultraviolet Spectroscopy, Red Shift, Telescopes
Scientific paper
It has been speculated that the quasar pair 1146 + B, C are two bright images of a single quasar produced by a gravitational lens. Here the author reports additional observations of these objects, made with an ultraviolet-sensitive spectrograph on the Multiple Mirror Telescope, which span the wavelength range 3200-7000 A and includes the strong semiforbidden C III line, as well as several Fe II bands not covered in earlier spectra. The ultraviolet spectra of the two quasars are different. There are also different velocity shifts between the quasars as measured by the semiforbidden C III and Mg II lines. Although it is impossible to rule out the lensing hypothesis, these observations increase the probability that these objects are just two quasars at nearly the same redshift.
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