High-resolution spatial analysis of a z ∼ 2 lensed galaxy using adaptive coadded source-plane reconstruction
Abstract
We present spatially resolved analysis of a lensed galaxy, SDSS1958+5950 at z = 2.225, from the Cambridge Sloan Survey of Wide 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 galaxy-source 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.
Additional Information
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) Accepted 2018 August 24. Received 2018 August 18; in original form 2018 June 25. We thank the comments of the anonymous referee, which helped to improve the paper. This work is based on data obtained at the W. M. Keck Observatory. We are grateful to the Keck Observatory staff for assistance with our observations, especially Randy Campbell and Jason. This research was supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. We thank Richard Ellis for sharing his OSIRIS data. SS thanks useful discussions with Prasun Dutta, GEARS3D, and CALENDS group. SS is also thankful to Surya Narayan Sahoo for technical help in formatting some of the figures in the paper. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community.Attached Files
Published - sty2352.pdf
Accepted Version - 1808.10468.pdf
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Additional details
- Eprint ID
- 91519
- Resolver ID
- CaltechAUTHORS:20181205-145347050
- CE170100013
- Australian Research Council
- Created
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2018-12-06Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field