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

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 = 0.230 ± 0.002, respectively, has a deflector with radius R_eff ≈ 3.4 arcsec, stellar mass |$\log (M_{\star }/M_{\odot })=11.64^{+0.20}_{-0.43}$|⁠, and extended isophotal shape variation. Simple lens models yield Einstein radii R_E = (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 z_s = 1.390 ± 0.001 and z_l = 0.335 ± 0.002, and Einstein radius R_E = (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.
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https://hal.archives-ouvertes.fr/hal-01863636
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Submitted on : Tuesday, August 28, 2018 - 7:20:23 PM
Last modification on : Wednesday, March 3, 2021 - 6:43:03 AM

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A. Agnello, H. Lin, N. Kuropatkin, E. Buckley-Geer, T. Anguita, et al.. DES meets Gaia: discovery of strongly lensed quasars from a multiplet search. Mon.Not.Roy.Astron.Soc., 2018, 479 (4), pp.4345-4354. ⟨10.1093/mnras/sty1419⟩. ⟨hal-01863636⟩

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