Resolving star-forming clumps in a z ∼2 lensed galaxy: A pixelated Bayesian approach

Soniya Sharma; Johan Richard; Tiantian Yuan; Vera Patrício; Lisa Kewley; Jane R. Rigby; Anshu Gupta; Nicha Leethochawalit

doi:10.1093/mnrasl/slab040

Resolving star-forming clumps in a z ∼2 lensed galaxy: A pixelated Bayesian approach

Soniya Sharma^*, Johan Richard^*, Tiantian Yuan, Vera Patrício, Lisa Kewley^*, Jane R. Rigby, Anshu Gupta, Nicha Leethochawalit

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We present a pixelized source reconstruction method applied on integral field spectroscopic observations of gravitationally lensed galaxies. We demonstrate the effectiveness of this method in a case study on the clumpy morphology of a z ∼2 lensed galaxy behind a group-scale lens. We use a Bayesian forward source modelling approach to reconstruct the surface brightness distribution of the source galaxy on a uniformly pixelized grid while accounting for the image point spread function. The pixelated approach is sensitive to clump sizes down to 100 pc and resolves smaller clump sizes with an improvement in the signal-to-noise ratio by almost a factor of 10 compared with more traditional ray-tracing approaches.

Original language	English
Pages (from-to)	L1-L5
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	505
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slab040
Publication status	Published - 1 Jul 2021

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title = "Resolving star-forming clumps in a z ∼2 lensed galaxy: A pixelated Bayesian approach",

abstract = "We present a pixelized source reconstruction method applied on integral field spectroscopic observations of gravitationally lensed galaxies. We demonstrate the effectiveness of this method in a case study on the clumpy morphology of a z ∼2 lensed galaxy behind a group-scale lens. We use a Bayesian forward source modelling approach to reconstruct the surface brightness distribution of the source galaxy on a uniformly pixelized grid while accounting for the image point spread function. The pixelated approach is sensitive to clump sizes down to 100 pc and resolves smaller clump sizes with an improvement in the signal-to-noise ratio by almost a factor of 10 compared with more traditional ray-tracing approaches.",

keywords = "Galaxies: evolution, Galaxies: high-redshift, Gravitational lensing: strong",

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T1 - Resolving star-forming clumps in a z ∼2 lensed galaxy

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AU - Sharma, Soniya

AU - Richard, Johan

AU - Yuan, Tiantian

AU - Patrício, Vera

AU - Kewley, Lisa

AU - Rigby, Jane R.

AU - Gupta, Anshu

AU - Leethochawalit, Nicha

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AB - We present a pixelized source reconstruction method applied on integral field spectroscopic observations of gravitationally lensed galaxies. We demonstrate the effectiveness of this method in a case study on the clumpy morphology of a z ∼2 lensed galaxy behind a group-scale lens. We use a Bayesian forward source modelling approach to reconstruct the surface brightness distribution of the source galaxy on a uniformly pixelized grid while accounting for the image point spread function. The pixelated approach is sensitive to clump sizes down to 100 pc and resolves smaller clump sizes with an improvement in the signal-to-noise ratio by almost a factor of 10 compared with more traditional ray-tracing approaches.

KW - Galaxies: evolution

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KW - Gravitational lensing: strong

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Resolving star-forming clumps in a z ∼2 lensed galaxy: A pixelated Bayesian approach

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