High Resolution spatial analysis of z ~2 lensed galaxy using pixelated source-reconstruction algorithm
Abstract
Strong gravitational lensing coupled with Integral field spectrographic observations (IFS) and adaptive optics (AO) imaging techniques have pioneered spatially resolved studies of high redshift galaxies (z>1). The most magnificent cases of strong lensing are the giant arcs/ multiple images around massive galaxy groups or clusters, yielding a total flux gain of a few times 10-100. However, the accuracy and precision of source-plane reconstructions of the most strongly lensed cases are fundamentally limited by two main factors: the lensing mass model and the effect of the differential point-spread-function (PSF). While a huge amount of effort has been made in the past decade to improve the lens models (e.g., Hubble Frontier Fields), relatively fewer work has been done on addressing the effect of the differential PSF. We conduct a detailed study to recover the source-plane physical properties of z~2 lensed galaxy by combining IFS observations on multiple images of the lensed target. To deal with PSF's from two observational data sets, firstly we demonstrate the use of a unique forward approach to obtain coadded brightness profile in the source plane. Further, to make the forward approach more generic, we develop a fully automated Bayesian image inversion technique implemented in the lensing software Lenstool. In my talk, I will present the case study of z=2 lensed galaxy in context of both these approaches. Then, I will finish with discussing the applications of this technique onto a large sample of lensed systems that will be available through future telescopes like JWST and GMT.
- Publication:
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American Astronomical Society Meeting Abstracts #233
- Pub Date:
- January 2019
- Bibcode:
- 2019AAS...23320605S