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2018MNRAS.479.4345A - Mon. Not. R. Astron. Soc., 479, 4345-4354 (2018/October-0)

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

AGNELLO A., LIN H., KUROPATKIN N., BUCKLEY-GEER E., ANGUITA T., SCHECHTER P.L., MORISHITA T., MOTTA V., ROJAS K., TREU T., AMARA A., AUGER M.W., COURBIN F., FASSNACHT C.D., FRIEMAN J., MORE A., MARSHALL P.J., McMAHON R.G., MEYLAN G., SUYU S.H., GLAZEBROOK K., MORGAN N., NORD B., ABBOTT T.M.C., ABDALLA F.B., ANNIS J., BECHTOL K., BENOIT-LEVY A., BERTIN E., BERNSTEIN R.A., BROOKS D., BURKE D.L., CARNERO ROSELL A., CARRETERO J., CUNHA C.E., D'ANDREA C.B., DA COSTA L.N., DESAI S., DRLICA-WAGNER A., EIFLER T.F., FLAUGHER B., GARCIA-BELLIDO J., GAZTANAGA E., GERDES D.W., GRUEN D., GRUENDL R.A., GSCHWEND J., GUTIERREZ G., HONSCHEID K., JAMES D.J., KUEHN K., LAHAV O., LIMA M., MAIA M.A.G., MARCH M., MENANTEAU F., MIQUEL R., OGANDO R.L.C., PLAZAS A.A., SANCHEZ E., SCARPINE V., SCHINDLER R., SCHUBNELL M., SEVILLA-NOARBE I., SMITH M., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., TUCKER D. and WECHSLER R.

Abstract (from CDS):

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.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gravitational lensing: strong - methods: statistical - techniques: image processing - surveys

Nomenclature: Table 1: [ALK2018] WGD JHHMM+DDMM N=20, [ALK2018] WGD JHHMM+DDMM source N=9. Table 2: [ALK2018] WGD JHHMM+DDMM AN N=26.

Simbad objects: 33

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