Agnello, A;
Lin, H;
Kuropatkin, N;
Buckley-Geer, E;
Anguita, T;
Schechter, L;
Morishita, T;
... Wechsler, R; + view all
(2018)
DES meets Gaia: discovery of strongly lensed quasars from a multiplet search.
Monthly Notices of the Royal Astronomical Society
, 479
(4)
pp. 4345-4354.
10.1093/mnras/sty1419.
Preview |
Text
sty1419.pdf - Published Version Download (1MB) | Preview |
Abstract
We report the discovery, spectroscopic confirmation, and first lens models of the first, strongly lensed quasars from a combined search in WISE and Gaia-DR1 over the DES footprint. Their Einstein radii span a range between ≈2.0 arcsec and ≈0.4 arcsec. Two of these (WGD2038-4008, RA = 20:38:02.65, Dec. = −40:08:14.64; WGD2021-4115, RA = 20:21:39.45, Dec. = −41:15:57.11) also have confirmed deflector redshifts. The four-image lens WGD2038-4008, with source and deflector redshifts s = 0.777 ± 0.001 and zl = 0.230 ± 0.002, respectively, has a deflector with radius Reff ≈ 3.4 arcsec, stellar mass log(M⋆/M⊙)=11.64+0.20−0.43 , and extended isophotal shape variation. Simple lens models yield Einstein radii RE = (1.30 ± 0.04) arcsec, axis ratio q = 0.75 ± 0.1 (compatible with that of the starlight) and considerable shear-ellipticity degeneracies. The two-image lens WGD2021-4115 has zs = 1.390 ± 0.001 and zl = 0.335 ± 0.002, and Einstein radius RE = (1.1 ± 0.1) arcsec, but higher-resolution imaging is needed to accurately separate the deflector and faint quasar image. Analogous lens model degeneracies hold for the other six lenses (J0146-1133, J0150-4041, J0235-2433, J0245-0556, J0259-2338, and J0508-2748) shown in this paper.
| Type: | Article |
|---|---|
| Title: | DES meets Gaia: discovery of strongly lensed quasars from a multiplet search |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty1419 |
| Publisher version: | https://doi.org/10.1093/mnras/sty1419 |
| Language: | English |
| Additional information: | This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: strong, methods: statistical, techniques: image processing, surveys |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10055349 |
Archive Staff Only
 |
View Item |
