Models of the strongly lensed quasar DES J0408-5354 Academic Article uri icon


  • 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 (tAB = (135.0 12.6) d, tBD = (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.

published proceedings


altmetric score

  • 13.33

author list (cited authors)

  • Agnello, A., Lin, H., Buckley-Geer, L., Treu, T., Bonvin, V., Courbin, F., ... Walker, A. R.

citation count

  • 18

complete list of authors

  • 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-Lévy, 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||García-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

publication date

  • September 2017