A gravitational lens candidate discovered with the Hubble Space Telescope

Details A gravitational lens candidate discovered with the Hubble Space Telescope A gravitational lens candidate discovered with the Hubble Space Telescope

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386l...1m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. L1-L3. Research supported by Space Telesco

Astronomy and Astrophysics

Astronomy

28

Gravitational Lenses, Hubble Space Telescope, Quasars, Radio Astronomy, Red Shift, Very Large Array (Vla), Milky Way Galaxy, Point Spread Functions, Radio Telescopes

Scientific paper

Evidence is reported for gravitational lensing of the high-redshift (z = 3.8) quasar 1208 + 101, observed as part of the Snapshot survey with the HST Planetary Camera. An HST V image taken on gyroscopes resolves the quasar into three point-source components, with the two fainter images having separations of 0.1 and 0.5 arcsec from the central bright component. A radio observation of the quasar with the VLA at 2 cm shows that, like most quasars of this redhsift, 1208 + 101 is radio quiet. Based on positional information alone, the probability that the observed optical components are chance superpositions of Galactic stars is small, but not negligible. Analysis of a combined ground-based spectrum of all three components, using the relative brightnesses of the HST image, supports the lensing hypothesis. If all the components are lensed images of the quasar, the observed configuration cannot be reproduced by simple lens models.

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