High-resolution spatial analysis of a z ~ 2 lensed galaxy using adaptive coadded source-plane reconstruction

Soniya Sharma*, Johan Richard, Tiantian Yuan, Anshu Gupta, Lisa Kewley, Vera Patrício, Nicha Leethochawalit, Tucker A. Jones

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)

    Abstract

    We present spatially resolved analysis of a lensed galaxy, SDSS1958+5950 at z = 2.225, from the Cambridge Sloan Survey ofWide Arcs in the Sky. We use our new high-resolution imaging data to construct a robust lens model for the galaxy group at z = 0.214.We employ the updated lens model to combine the Integral Field Spectrographic observations on two highly distorted images of the lensed target. We adopt a forward-modelling approach to deconvolve the effects of point spread function from the combined source-plane reconstruction. The approach is adapted to the lens model magnification and enables a resolution of ~170 pc in the galaxysource plane. We propose an ongoing merger as the origin of the lensed system on the basis of its source-plane morphology, kinematics and rest-frame emission-line ratios. Using our novel technique of adaptive coadded source plane reconstruction, we are able to detect different components in the velocity gradient that were not seen in previous studies of this object, plausibly belonging to different components in the merging system.

    Original languageEnglish
    Pages (from-to)1427-1440
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Volume481
    Issue number2
    DOIs
    Publication statusPublished - 1 Dec 2018

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