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Models of the strongly lensed quasar DES J0408-5354

Author(s): Agnello, A; Lin, H; Buckley-Geer, L; Treu, T; Bonvin, V; et al

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Abstract: We present detailed modelling of the recently discovered, quadruply lensed quasar J0408-5354, with the aim of interpreting its remarkable configuration: besides three quasar images (A, B, D) around the main deflector (G1), a fourth image (C) is significantly reddened and dimmed by a perturber (G2) which is not detected in the Dark Energy Survey imaging data. From lens models incorporating (dust-corrected) flux ratios, we find a perturber Einstein radius 0.04 arcsec less than or similar to R-E,R- G2 less than or similar to 0.2 arcsec and enclosed mass M-p(R-E,R- G2) less than or similar to 1.0 x 10(10) M-circle dot. The main deflector has stellar mass log(10)(M-star/M-circle dot) = 11.49(-0.32)(+0.46), a projected mass M-p(R-E,R- G1) approximate to 6 x 10(11) M-circle dot within its Einstein radius R-E,R- G1 = (1.85 +/- 0.15) arcsec and predicted velocity dispersion 267-280 km s(-1). Follow-up images from a companion monitoring campaign show additional components, including a candidate second source at a redshift between the quasar and G1. Models with free perturbers, and dust-corrected and delay-corrected flux ratios, are also explored. The predicted time-delays (Delta t(AB) = (135.0 +/- 12.6) d, Delta t(BD) = (21.0 +/- 3.5) d) roughly agree with those measured, but better imaging is required for proper modelling and comparison. We also discuss some lessons learnt from J0408-5354 on lensed quasar finding strategies, due to its chromaticity and morphology.
Publication Date: Dec-2017
Electronic Publication Date: 7-Sep-2017
Citation: Agnello, A, Lin, H, Buckley-Geer, L, Treu, T, Bonvin, V, Courbin, F, Lemon, C, Morishita, T, Amara, A, Auger, MW, Birrer, S, Chan, J, Collett, T, More, A, Fassnacht, CD, Frieman, J, Marshall, PJ, McMahon, RG, Meylan, G, Suyu, SH, Castander, F, Finley, D, Howell, A, Kochanek, C, Makler, M, Martini, P, Morgan, N, Nord, B, Ostrovski, F, Schechter, P, Tucker, D, Wechsler, R, Abbott, TMC, Abdalla, FB, Allam, S, Benoit-Levy, A, Bertin, E, Brooks, D, Burke, DL, Rosell, A Carnero, Kind, M Carrasco, Carretero, J, Crocce, M, Cunha, CE, D Andrea, CB, da Costa, LN, Desai, S, Dietrich, JP, Eifler, TF, Flaugher, B, Fosalba, P, Garcia-Bellido, J, Gaztanaga, E, Gill, MS, Goldstein, DA, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Kuropatkin, N, Li, TS, Lima, M, Maia, MAG, March, M, Marshall, JL, Melchior, P, Menanteau, F, Miquel, R, Ogando, RLC, Plazas, AA, Romer, AK, Sanchez, E, Schindler, R, Schubnell, M, Sevilla-Noarbe, I, Smith, M, Smith, RC, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thomas, D, Walker, AR. (2017). Models of the strongly lensed quasar DES J0408-5354. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 472 (4038 - 4050. doi:10.1093/mnras/stx2242
DOI: doi:10.1093/mnras/stx2242
ISSN: 0035-8711
EISSN: 1365-2966
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Pages: 4038 - 4050
Type of Material: Journal Article
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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