Models of the strongly lensed quasar DES J0408-5354

A. Agnello, H. Lin, L. Buckley-Geer, T. Treu, V. Bonvin, F. Courbin, C. Lemon, T. Morishita, A. Amara, M. W. Auger, S. Birrer, J. Chan, T. Collett, A. More, C. D. Fassnacht, J. Frieman, P. J. Marshall, R. G. McMahon, G. Meylan, S. H. SuyuF. Castander, D. Finley, A. Howell, C. Kochanek, M. Makler, P. Martini, N. Morgan, B. Nord, F. Ostrovski, P. Schechter, D. Tucker, R. Wechsler, T. M.C. Abbott, F. B. Abdalla, S. Allam, A. Benoit-Lévy, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. Crocce, C. E. Cunha, C. B. D'Andrea, L. N. da Costa, S. Desai, J. P. Dietrich, T. F. Eifler, B. Flaugher, P. Fosalba, J. García-Bellido, E. Gaztanaga, M. S. Gill, D. A. Goldstein, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, K. Honscheid, D. J. James, K. Kuehn, N. Kuropatkin, T. S. Li, M. Lima, M. A.G. Maia, M. March, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, R. L.C. Ogando, A. A. Plazas, A. K. Romer, E. Sanchez, R. Schindler, M. Schubnell, I. Sevilla-Noarbe, M. Smith, R. C. Smith, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, D. Thomas, A. R. Walker

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    10 Citations (Scopus)

    Abstract

    © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 ≲ RE, G2 ≲ 0.2 arcsec and enclosed mass Mp(RE, G2) ≲ 1.0 × 1010 MO˙. The main deflector has stellar mass log10(M*/MO˙) = 11.49-0.32+0.46, a projected mass Mp(RE, G1) ≈ 6 × 1011 MO˙ within its Einstein radius RE, 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 (ΔtAB = (135.0 ± 12.6) d, ΔtBD = (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.
    Original languageEnglish
    Article numberstx2242
    Pages (from-to)4038-4050
    JournalMonthly Notices of the Royal Astronomical Society
    Volume472
    Issue number4
    DOIs
    Publication statusPublished - 1 Dec 2017

    Keywords

    • Catalogues
    • Gravitational lensing: strong
    • Methods: statistical
    • Techniques: image processing

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