Photometry, Centroid and Point-spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars
Abstract
The Vera C. Rubin Observatory's LSST Camera (LSSTCam) pixel response has been characterized using laboratory measurements with a grid of artificial stars. We quantify the contributions to photometry, centroid, point-spread function size, and shape measurement errors due to small anomalies in the LSSTCam CCDs. The main sources of those anomalies are quantum efficiency variations and pixel area variations induced by the amplifier segmentation boundaries and "tree-rings"—circular variations in silicon doping concentration. This laboratory study using artificial stars projected on the sensors shows overall small effects. The residual effects on point-spread function (PSF) size and shape are below 0.1%, meeting the ten-year LSST survey science requirements. However, the CCD mid-line presents distortions that can have a moderate impact on PSF measurements. This feature can be avoided by masking the affected regions. Effects of tree-rings are observed on centroids and PSFs of the artificial stars and the nature of the effect is confirmed by a study of the flat-field response. Nevertheless, further studies of the full-focal plane with stellar data should more completely probe variations and might reveal new features, e.g., wavelength-dependent effects. The results of this study can be used as a guide for the on-sky operation of LSSTCam.
- Authors:
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[1];
[2];
[3];
[2];
[4];
[5];
[2];
[2];
[2];
[2];
[2];
[6];
[7];
[1];
[2]
- University of Michigan, Ann Arbor, MI (United States)
- Stanford University, CA (United States). Kavli Institute for Particle Astrophysics & Cosmology; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- University of California, Davis, CA (United States)
- University of California, Irvine, CA (United States)
- Stanford University, CA (United States). Kavli Institute for Particle Astrophysics & Cosmology
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Princeton University, NJ (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- OSTI Identifier:
- 2204512
- Grant/Contract Number:
- AC02-76SF00515; SC0019193; AST-1258333; AST-1202910
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Publications of the Astronomical Society of the Pacific
- Additional Journal Information:
- Journal Volume: 135; Journal Issue: 1053; Journal ID: ISSN 0004-6280
- Publisher:
- Astronomical Society of the Pacific (ASP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; CCD; LSST camera; Rubin Observatory; Legacy Survey of Space and Time; LSST
Citation Formats
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés A., Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Chris, Soares-Santos, Marcelle, and Roodman, Aaron. Photometry, Centroid and Point-spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars. United States: N. p., 2023.
Web. doi:10.1088/1538-3873/ad0a73.
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés A., Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Chris, Soares-Santos, Marcelle, & Roodman, Aaron. Photometry, Centroid and Point-spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars. United States. https://doi.org/10.1088/1538-3873/ad0a73
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés A., Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Chris, Soares-Santos, Marcelle, and Roodman, Aaron. Fri .
"Photometry, Centroid and Point-spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars". United States. https://doi.org/10.1088/1538-3873/ad0a73. https://www.osti.gov/servlets/purl/2204512.
@article{osti_2204512,
title = {Photometry, Centroid and Point-spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars},
author = {Esteves, Johnny H. and Utsumi, Yousuke and Snyder, Adam and Schutt, Theo and Broughton, Alex and Trbalic, Bahrudin and Mau, Sidney and Rasmussen, Andrew and Plazas Malagón, Andrés A. and Bradshaw, Andrew and Marshall, Stuart and Digel, Seth and Chiang, James and Rykoff, Eli and Waters, Chris and Soares-Santos, Marcelle and Roodman, Aaron},
abstractNote = {The Vera C. Rubin Observatory's LSST Camera (LSSTCam) pixel response has been characterized using laboratory measurements with a grid of artificial stars. We quantify the contributions to photometry, centroid, point-spread function size, and shape measurement errors due to small anomalies in the LSSTCam CCDs. The main sources of those anomalies are quantum efficiency variations and pixel area variations induced by the amplifier segmentation boundaries and "tree-rings"—circular variations in silicon doping concentration. This laboratory study using artificial stars projected on the sensors shows overall small effects. The residual effects on point-spread function (PSF) size and shape are below 0.1%, meeting the ten-year LSST survey science requirements. However, the CCD mid-line presents distortions that can have a moderate impact on PSF measurements. This feature can be avoided by masking the affected regions. Effects of tree-rings are observed on centroids and PSFs of the artificial stars and the nature of the effect is confirmed by a study of the flat-field response. Nevertheless, further studies of the full-focal plane with stellar data should more completely probe variations and might reveal new features, e.g., wavelength-dependent effects. The results of this study can be used as a guide for the on-sky operation of LSSTCam.},
doi = {10.1088/1538-3873/ad0a73},
journal = {Publications of the Astronomical Society of the Pacific},
number = 1053,
volume = 135,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2023},
month = {Fri Dec 01 00:00:00 EST 2023}
}
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