Hubble Space Telescope imaging of the large-redshift gravitational lens candidate 1208 + 1011

Details Hubble Space Telescope imaging of the large-redshift gravitational lens candidate 1208 + 1011 Hubble Space Telescope imaging of the large-redshift gravitational lens candidate 1208 + 1011

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l...1b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. L1-L4. Research supported by Space

Astronomy and Astrophysics

Astrophysics

24

Astronomical Photometry, Gravitational Lenses, Hubble Space Telescope, Quasars, Red Shift, Point Spread Functions, Stellar Luminosity

Scientific paper

Four-color photometry obtained with the HST is consistent with the hypothesis that the light from the quasar 1208 + 1011 (z = 3.8) is gravitationally lensed. Guided exposures taken with the HST Planetary Camera resolve the quasar image into two point-source components separated by 0.476 +/- 0.004 arcsec. The intensity ratio of the components is approximately 4:1 in each of four broadband HST filters with mean wavelengths of 4352, 5416, 6898, and 8922 A. The HST photometry, when combined with high-resolution ground-based spectroscopy, rules out the possibility that the secondary component is a Galactic star. The limit on additional point sources is 3 percent of the brighter image for separations greater than 0.5 arcsec from the primary component and 5 percent of the brighter component for separations between 0.1 and 0.5 arcsec. If the gravitational lens is an ordinary galaxy, it would not have been detected on the HST images.

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