DES meets Gaia: discovery of strongly lensed quasars from a multiplet search

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.

M Soares-Santos | K Honscheid | D J James | D. Gerdes | J. Frieman | O. Lahav | G. Meylan | F. Abdalla | F. Courbin | J. García-Bellido | K. Honscheid | M. Maia | R. McMahon | R. Ogando | F. Sobreira | M. Swanson | P. Marshall | A. Amara | D. Tucker | Huan Lin | P. Schechter | S. Suyu | C. Fassnacht | T. Treu | M. Auger | A. Agnello | R. Gruendl | J. Annis | J. Gschwend | I. Sevilla-Noarbe | R. Wechsler | T. Abbott | K. Bechtol | E. Bertin | D. Brooks | E. Buckley-Geer | D. Burke | J. Carretero | C. Cunha | C. D'Andrea | S. Desai | A. Drlica-Wagner | T. Eifler | B. Flaugher | E. Gaztañaga | D. Gruen | G. Gutiérrez | D. James | K. Kuehn | N. Kuropatkin | M. Lima | F. Menanteau | R. Miquel | A. Plazas | V. Scarpine | R. Schindler | M. Schubnell | M. Smith | E. Suchyta | G. Tarlé | Mathew Smith | M. Soares-Santos | J. Garc'ia-Bellido | A. Benoit-Lévy | M. March | E. Sánchez | B. Nord | T. Anguita | R. Bernstein | K. Glazebrook | P. Marshall | V. Motta | K. Rojas | M. Lima | N. Morgan | A. More | L. D. da Costa | S Desai | K Kuehn | B Flaugher | D W Gerdes | R Miquel | A Agnello | H Lin | N Kuropatkin | E Buckley-Geer | T Anguita | P L Schechter | T Morishita | V Motta | K Rojas | T Treu | A Amara | M W Auger | F Courbin | C D Fassnacht | J Frieman | A More | P J Marshall | R G McMahon | G Meylan | S H Suyu | K Glazebrook | N Morgan | B Nord | T M C Abbott | F B Abdalla | J Annis | K Bechtol | A Benoit-Lévy | E Bertin | R A Bernstein | D Brooks | D L Burke | A Carnero Rosell | J Carretero | C E Cunha | C B D’Andrea | L N da Costa | A Drlica-Wagner | T F Eifler | J García-Bellido | E Gaztanaga | D Gruen | R A Gruendl | J Gschwend | G Gutierrez | O Lahav | M Lima | M A G Maia | M March | F Menanteau | R L C Ogando | A A Plazas | E Sanchez | V Scarpine | R Schindler | M Schubnell | I Sevilla-Noarbe | M Smith | F Sobreira | E Suchyta | M E C Swanson | G Tarle | D Tucker | R Wechsler | T. Morishita | A. C. Rosell | L. Costa | H. Lin | H. Lin | K. Benoit-Lévy | M. Swanson

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