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Deconvolution of JWST/MIRI Images: Applications to an Active Galactic Nucleus Model and GATOS Observations of NGC 5728

Lookup NU author(s): Dr David Rosario

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2024. The Author(s). Published by the American Astronomical Society.The superb image quality, stability, and sensitivity of JWST permit deconvolution techniques to be pursued with a fidelity unavailable to ground-based observations. We present an assessment of several deconvolution approaches to improve image quality and mitigate the effects of the complex JWST point-spread function (PSF). The optimal deconvolution method is determined by using WebbPSF to simulate JWST’s complex PSF and MIRISim to simulate multiband JWST/Mid-Infrared Imager Module (MIRIM) observations of a toy model of an active galactic nucleus (AGN). Five different deconvolution algorithms are tested: (1) Kraken deconvolution, (2) Richardson–Lucy, (3) the adaptive imaging deconvolution algorithm, (4) sparse regularization with the Condat–Vũ algorithm, and (5) iterative Wiener filtering and thresholding. We find that Kraken affords the greatest FWHM reduction of the nuclear source of our MIRISim observations for the toy AGN model while retaining good photometric integrity across all simulated wave bands. Applying Kraken to Galactic Activity, Torus, and Outflow Survey (GATOS) multiband JWST/MIRIM observations of the Seyfert 2 galaxy NGC 5728, we find that the algorithm reduces the FWHM of the nuclear source by a factor of 1.6–2.2 across all five filters. Kraken images facilitate detection of extended nuclear emission ∼2 5 (∼470 pc, position angle; 115°) in the SE–NW direction, especially at the longest wavelengths. We demonstrate that Kraken is a powerful tool to enhance faint features otherwise hidden in the complex JWST PSF.


Publication metadata

Author(s): Leist MT, Packham C, Rosario DJV, Hope DA, Alonso-Herrero A, Hicks EKS, Honig S, Zhang L, Davies R, Diaz-Santos T, Gonzalez-Martin O, Bellocchi E, Boorman PG, Combes F, Garcia-Bernete I, Garcia-Burillo S, Garcia-Lorenzo B, Haidar H, Ichikawa K, Imanishi M, Jefferies SM, Labiano A, Levenson NA, Nikutta R, Pereira-Santaella M, Almeida CR, Ricci C, Rigopoulou D, Schaefer W, Stalevski M, Ward MJ, Fuller L, Izumi T, Rouan D, Shimizu T

Publication type: Article

Publication status: Published

Journal: Astronomical Journal

Year: 2024

Volume: 167

Issue: 3

Print publication date: 01/03/2024

Online publication date: 07/02/2024

Acceptance date: 21/12/2023

Date deposited: 05/03/2024

ISSN (print): 0004-6256

ISSN (electronic): 1538-3881

Publisher: American Astronomical Society

URL: https://doi.org/10.3847/1538-3881/ad1886

DOI: 10.3847/1538-3881/ad1886

Data Access Statement: The JWST observations are associated with program #2064, the specific observations analyzed can be accessed via doi:10.17909/d1my-ya64. The specific HST observation used for the toy AGN model can be accessed via doi:10.17909/yjb7-aa73.


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