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

Research output: Contribution to journalArticle

9 Scopus citations

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 ≲ RE, G2 ≲ 0.2 arcsec and enclosed mass Mp(RE, G2) ≲ 1.0 × 1010 M. The main deflector has stellar mass log10(M*/MO˙) = 11.49-0.32+0.46, 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 (US)
Article numberstx2242
Pages (from-to)4038-4050
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume472
Issue number4
DOIs
StatePublished - Dec 1 2017
Externally publishedYes

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Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Agnello, A., Lin, H., Buckley-Geer, L., Treu, T., Bonvin, V., Courbin, F., Lemon, C., Morishita, T., Amara, A., Auger, M. W., Birrer, S., Chan, J., Collett, T., More, A., Fassnacht, C. D., Frieman, J., Marshall, P. J., McMahon, R. G., Meylan, G., ... Walker, A. R. (2017). Models of the strongly lensed quasar DES J0408-5354. Monthly Notices of the Royal Astronomical Society, 472(4), 4038-4050. [stx2242]. https://doi.org/10.1093/mnras/stx2242