Abstract
Deep K-band observations are presented of the double image quasar Q2345+007. This has the largest separation (7″.1) of any quasar image pair considered as gravitationally lensed, so the required lens is massive (1013 M⊙). 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.
Original language | English (US) |
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Pages (from-to) | 528-532 |
Number of pages | 5 |
Journal | Astrophysical Journal |
Volume | 433 |
Issue number | 2 |
DOIs | |
State | Published - Oct 1 1994 |
Keywords
- Gravitational lensing
- Infrared: galaxies
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science