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Models of the strongly lensed quasar DES J0408-5354

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posted on 2023-06-09, 12:12 authored by A Agnello, H Lin, L Buckley-Geer, T Treu, V Bonvin, F Courbin, C Lemon, T Morishita, Kathy RomerKathy Romer, others
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 × 1011M 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.

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

472

Page range

4038-4050

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-02-19

First Open Access (FOA) Date

2018-02-19

First Compliant Deposit (FCD) Date

2018-02-16

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