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Models of the strongly lensed quasar DES J0408-5354

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  • Adriano Agnello
  • Huan Lin
  • L. Buckley-Geer
  • T. Treu
  • V. Bonvin
  • F. Courbin
  • C. Lemon
  • T. Morishita
  • M. W. Auger
  • S. Birrer
  • J. Chan
  • A. More
  • C. D. Fassnacht
  • J. Frieman
  • P. J. Marshall
  • R. G. McMahon
  • G. Meylan
  • S. H. Suyu
  • F. 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. Desa
  • J. P. Dietrich
  • T. F. Eifler
  • B. Flaugher
  • P. Fosalba
  • J. García-Bellido
  • E. Gaztanaga
  • 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
  • R. C. Smith
  • F. Sobreira
  • E. Suchyta
  • M. E. C. Swanson
  • G. Tarle
  • A. R. Walker
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 M. The main deflector has stellar mass log10(M/M)=11.49∧{+0.46}∨{−0.32}, a projected mass Mp(RE, G1) ≈ 6 × 1011 M 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
Pages (from-to)4038–4050
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number4
Early online date7 Sep 2017
DOIs
Publication statusPublished - Dec 2017

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    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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