Back to Search
Start Over
Discovery of Two Gravitationally Lensed Quasars with Image Separations of 3″ from the Sloan Digital Sky Survey
- Source :
- The Astrophysical Journal. 622:106-115
- Publication Year :
- 2005
- Publisher :
- American Astronomical Society, 2005.
-
Abstract
- We report the discovery of two doubly-imaged quasars, SDSS J100128.61+502756.9 and SDSS J120629.65+433217.6, at redshifts of 1.838 and 1.789 and with image separations of 2.86'' and 2.90'', respectively. The objects were selected as lens candidates from the Sloan Digital Sky Survey (SDSS). Based on the identical nature of the spectra of the two quasars in each pair and the identification of the lens galaxies, we conclude that the objects are gravitational lenses. The lenses are complicated; in both systems there are several galaxies in the fields very close to the quasars, in addition to the lens galaxies themselves. The lens modeling implies that these nearby galaxies contribute significantly to the lens potentials. On larger scales, we have detected an enhancement in the galaxy density near SDSS J100128.61+502756.9. The number of lenses with image separation of ~3'' in the SDSS already exceeds the prediction of simple theoretical models based on the standard Lambda-dominated cosmology and observed velocity function of galaxies.<br />Comment: 24 pages, 9 figures, accepted for publication in ApJ
- Subjects :
- Physics
media_common.quotation_subject
Astrophysics (astro-ph)
Astrophysics::Instrumentation and Methods for Astrophysics
FOS: Physical sciences
Astronomy and Astrophysics
Quasar
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Cosmology
Galaxy
Spectral line
Redshift
law.invention
Gravitation
Lens (optics)
Space and Planetary Science
law
Sky
Astrophysics::Galaxy Astrophysics
media_common
Subjects
Details
- ISSN :
- 15384357 and 0004637X
- Volume :
- 622
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....091ab62c80179299fbc70e3a07703553