Differencing and Coadding JWST Images with Matched Point-spread Function
We present an algorithm to derive difference images for data taken with JWST with matched point-spread functions (PSFs). It is based on the saccadic fast Fourier transform method but with revisions to accommodate the rotations and spatial variations of the PSFs. It allows for spatially varying kerne...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astronomical Journal |
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| Online Access: | https://doi.org/10.3847/1538-3881/ad36cb |
| _version_ | 1797194443382587392 |
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| author | Lei Hu Lifan Wang |
| author_facet | Lei Hu Lifan Wang |
| author_sort | Lei Hu |
| collection | DOAJ |
| description | We present an algorithm to derive difference images for data taken with JWST with matched point-spread functions (PSFs). It is based on the saccadic fast Fourier transform method but with revisions to accommodate the rotations and spatial variations of the PSFs. It allows for spatially varying kernels in B-spline form with separately controlled photometric scaling and Tikhonov kernel regularization for harnessing the ultimate fitting flexibility. We present this method using the JWST/NIRCam images of galaxy cluster Abell 2744 acquired in JWST Cycle 1 as the test data. The algorithm can be useful for time-domain source detection and differential photometry with JWST. It can also coadd images of multiple exposures taken at different field orientations. The coadded images preserve the sharpness of the central cores of the PSFs, and the positions and shapes of the objects are matched precisely with B-splines across the field. |
| first_indexed | 2024-04-24T05:56:22Z |
| format | Article |
| id | doaj.art-1c76a9ba74804b3ca6a0450f33de16f7 |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-04-24T05:56:22Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-1c76a9ba74804b3ca6a0450f33de16f72024-04-23T08:58:26ZengIOP PublishingThe Astronomical Journal1538-38812024-01-01167523110.3847/1538-3881/ad36cbDifferencing and Coadding JWST Images with Matched Point-spread FunctionLei Hu0https://orcid.org/0000-0001-7201-1938Lifan Wang1https://orcid.org/0000-0001-7092-9374Purple Mountain Observatory Nanjing 210023 , People’s Republic of China ; leihu@andrew.cmu.edu; McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University , 5000 Forbes Ave., Pittsburgh, PA 15213, USAGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, Texas A&M University , Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843, USA ; lifan@tamu.eduWe present an algorithm to derive difference images for data taken with JWST with matched point-spread functions (PSFs). It is based on the saccadic fast Fourier transform method but with revisions to accommodate the rotations and spatial variations of the PSFs. It allows for spatially varying kernels in B-spline form with separately controlled photometric scaling and Tikhonov kernel regularization for harnessing the ultimate fitting flexibility. We present this method using the JWST/NIRCam images of galaxy cluster Abell 2744 acquired in JWST Cycle 1 as the test data. The algorithm can be useful for time-domain source detection and differential photometry with JWST. It can also coadd images of multiple exposures taken at different field orientations. The coadded images preserve the sharpness of the central cores of the PSFs, and the positions and shapes of the objects are matched precisely with B-splines across the field.https://doi.org/10.3847/1538-3881/ad36cbAstronomy softwareTransient detection |
| spellingShingle | Lei Hu Lifan Wang Differencing and Coadding JWST Images with Matched Point-spread Function The Astronomical Journal Astronomy software Transient detection |
| title | Differencing and Coadding JWST Images with Matched Point-spread Function |
| title_full | Differencing and Coadding JWST Images with Matched Point-spread Function |
| title_fullStr | Differencing and Coadding JWST Images with Matched Point-spread Function |
| title_full_unstemmed | Differencing and Coadding JWST Images with Matched Point-spread Function |
| title_short | Differencing and Coadding JWST Images with Matched Point-spread Function |
| title_sort | differencing and coadding jwst images with matched point spread function |
| topic | Astronomy software Transient detection |
| url | https://doi.org/10.3847/1538-3881/ad36cb |
| work_keys_str_mv | AT leihu differencingandcoaddingjwstimageswithmatchedpointspreadfunction AT lifanwang differencingandcoaddingjwstimageswithmatchedpointspreadfunction |