Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433..528m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 2, p. 528-532
Astronomy and Astrophysics
Astronomy
5
Astronomical Models, Dark Matter, Gravitational Lenses, Infrared Astronomy, Infrared Imagery, Quasars, Astronomical Photometry, Hubble Space Telescope, Mercury Cadmium Tellurides, Reflecting Telescopes, Sky Surveys (Astronomy), Visible Spectrum
Scientific paper
Deep K-band observations are presented of the double image quasar Q2345+007. This has the largest separation (7.1 sec) of any quasar image pair considered as gravitationally lensed, so the required lens is massive (1013 solar masses). No lens has been detected in previous deep images at visible wavelengths, and we find no lens to limiting K magnitude 20.0 in the infrared image. This constrains any lens to being much less luminous than brightest cluster galaxies, while the lens must be much more massive than such galaxies to produce the observed separation. Because spectral data indicate exceptional intrinsic similarity in the quasar image components, this pair remains as the most intriguing example of an observed configuration requiring the presence of massive, concentrated dark matter acting as a gravitational lens.
McLeod Brian
Rieke Marcia
Weedman Daniel
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