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Type: Artigo
Title: DES meets Gaia: discovery of strongly lensed quasars from a multiplet search
Author: Agnello, A.
Lin, H.
Kuropatkin, N.
Buckley-Geer, E.
Anguita, T.
Schechter, L.
Morishita, T.
Motta, V.
Rojas, K.
Treu, T.
Amara, A.
Auger, 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.
Rosell, A. C.
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.
Sanchez, E.
Scarpine, V.
Schindler, R.
Schubnell, M.
Sevilla-Noarbe, I.
Smith, M.
Soares-Santos, M.
Sobreira, F.
Suchyta, E.
Swanson, E. C.
Tarle, G.
Tucker, D.
Wechsler, R.
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 approximate to 2.0 arcsec and approximate to 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 z(l) = 0.230 +/- 0.002, respectively, has a deflector with radius R-eff approximate to 3.4 arcsec, stellar mass log(M-star /M-circle dot) = 11.64(-0.43)(+ 0.20), 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.
Subject: Processamento de imagens
Análise de dados
Image processing
Data analytics
Country: Reino Unido
Editor: Oxford University Press
Rights: aberto
Identifier DOI: 10.1093/mnras/sty1419
Date Issue: 2018
Appears in Collections:IFGW - Artigos e Outros Documentos

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