SITCOMTN-162: Testing the implementation of Metadetection and Cell-Based Coadds on Abell 360 LSSTComCam data

Dataset · Fri Oct 24 04:00:00 EDT 2025

DOI:https://doi.org/10.71929/rubin/3000578· OSTI ID:3000578

Gorsuch, Miranda R. ^[1]; Kannawadi, Arun ^[2]; Adari, Prakruth ^[3]; Englert, Anthony ^[4]; Becker, Matthew R. ^[5]; Combet, Céline ^[6]; Guinot, Axel ^[7]; Mandelbaum, Rachel ^[7]; Mau, Sidney ^[8]; Pedersen, Eske M. ^[9]; von der Linden, Anja ^[3]

---

1. Department of Physics, University of Wisconsin-Madison
2. Department of Physics, Duke University; Department of Astrophysical Sciences, Princeton University
3. Department of Physics and Astronomy, Stony Brook University
4. Department of Physics, Brown University
5. High Energy Physics Division, Argonne National Laboratory
6. Université Grenoble Alpes, CNRS/IN2P3, LPSC
7. McWilliams Center for Cosmology & Astrophysics, Department of Physics, Carnegie Mellon University
8. Department of Physics, Duke University
9. Department of Physics, Harvard University

The purpose of this technote is to test the technical quality of LSSTComCam commissioning data, specifically the Rubin_SV_38_7 field, by utilizing cell-based coadds and Metadetection by measuring the tangential and cross weak lensing shear profiles of the massive cluster Abell 360 (called A360 throughout the technote). The process entails generating the cell-based coadds for Metadetection to run on, identifying and removing cluster member galaxies, applying quality cuts, calibrating the shear measurements, and validation. Cell-based coadds and Metadetection are both currently in the process of being implemented within the LSST Science Pipelines at the time of this technote. There is substantial technical value in attempting a difficult measurement prior to full implementation. Measuring the tangential shear around A360 will showcase the current abilities of these algorithms, as well as highlight where work is still needed. As seen from the resulting shear profile of A360, the cell-based coadds and Metadetection are able to work in tandem to produce a shear catalog and resulting reduced shear profile. This technote is one part of a series studying A360 in order to both stress test the commissioning camera and demonstrate the technical capabilities of the Vera Rubin Observatory. We study the quality of the PSF modeling and impact it can have on cluster WL in [Combet et al., 2025], implementation of cell-based coadds and subsequent use for Metadetect [Sheldon et al., 2023] in this technote, photometric calibration in (in prep), source selection and photometric redshifts in [Adari et al., 2025], use of Anacal [Li et al., 2024] to produce a cluster shear profile in [Li et al., 2025], and background subtraction in this field and Fornax in [Zhou et al., 2025].

• Research Organization: NSF-DOE Vera C. Rubin Observatory
• Sponsoring Organization: U.S. National Science Foundation; U.S. Department of Energy Office of Science
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 3000578
• Report Number(s): Vera C. Rubin Observatory Commissioning Technical Note SITCOMTN-162
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS