Journal
ASTROPHYSICAL JOURNAL
Volume 765, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/765/2/139
Keywords
gravitational lensing: strong; quasars: individual (SDSS J132059.17+164402.59, SDSS J132059.73+164405.6)
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Funding
- FIRST program Subaru Measurements of Images and Redshifts (SuMIRe), World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Japan Society for the Promotion of Science (JSPS) [23740161, 24740171]
- JSPS Research Fellowship
- Deutsche Forschungsgemeinschaft [SL172/1-1]
- NSF [AST-0707266]
- National Aeronautics and Space Administration
- Grants-in-Aid for Scientific Research [23740161, 11J06103, 24740171] Funding Source: KAKEN
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We report the discovery of a pair of quasars at z = 1.487, with a separation of 8 ''.585 +/- 0 ''.002. Subaru Telescope infrared imaging reveals the presence of an elliptical and a disk-like galaxy located almost symmetrically between the quasars, in a cross-like configuration. Based on absorption lines in the quasar spectra and the colors of the galaxies, we estimate that both galaxies are located at redshift z = 0.899. This, as well as the similarity of the quasar spectra, suggests that the system is a single quasar multiply imaged by a galaxy group or cluster acting as a gravitational lens, although the possibility of a binary quasar cannot be fully excluded. We show that the gravitational lensing hypothesis implies that these galaxies are not isolated, but must be embedded in a dark matter halo of virial mass similar to 4 x 10(14) h(70)(-1) M-circle dot assuming a Navarro-Frenk-White model with a concentration parameter of c(vir) = 6, or a singular isothermal sphere profile with a velocity dispersion of similar to 670 km s(-1). We place constraints on the location of the dark matter halo, as well as the velocity dispersions of the galaxies. In addition, we discuss the influence of differential reddening, microlensing, and intrinsic variability on the quasar spectra and broadband photometry.
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