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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 pixel response has been characterized using laboratory measurements with a grid of artificial stars. Here, 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. We studied the effects using artificial stars projected on the sensors and find that the resulting measurement uncertainties pass the ten-year LSST survey science requirements. In addition, we verify that the tree-ring effects can be corrected using flat-field images if needed, because the astronomic shifts and shape measurement errors they induce correlate well with the flat-field signal. Nevertheless, further sensor anomaly studies with on-sky data should probe possible temporal and wavelength-dependent effects.
- Authors:
-
[1];
[2];
[3];
[2];
[4];
[5];
[2];
[2];
[2];
[6];
[7];
[1];
[2]
- University of Michigan, Ann Arbor, MI (United States)
- Stanford University, CA (United States); 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)
- 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); National Science Foundation (NSF)
- OSTI Identifier:
- 2001131
- Grant/Contract Number:
- AC02-76SF00515; AST-1258333; AST-1202910
- Resource Type:
- Accepted Manuscript
- Journal Name:
- arXiv
- Additional Journal Information:
- Journal Name: arXiv
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Rubin Observatory; Rubin Observatory Legacy Survey of Space and Time (LSST); LSST camera; CCDs; tree-rings; shear
Citation Formats
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés Alejandro, Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Christopher, 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:10.48550/arXiv.2308.00919.
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés Alejandro, Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Christopher, 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/10.48550/arXiv.2308.00919
Esteves, Johnny H., Utsumi, Yousuke, Snyder, Adam, Schutt, Theo, Broughton, Alex, Trbalic, Bahrudin, Mau, Sidney, Rasmussen, Andrew, Plazas Malagón, Andrés Alejandro, Bradshaw, Andrew, Marshall, Stuart, Digel, Seth, Chiang, James, Rykoff, Eli, Waters, Christopher, Soares-Santos, Marcelle, and Roodman, Aaron. Thu .
"Photometry, Centroid and Point-Spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars". United States. https://doi.org/10.48550/arXiv.2308.00919.
@article{osti_2001131,
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 Alejandro and Bradshaw, Andrew and Marshall, Stuart and Digel, Seth and Chiang, James and Rykoff, Eli and Waters, Christopher and Soares-Santos, Marcelle and Roodman, Aaron},
abstractNote = {The Vera C. Rubin Observatory's LSST Camera pixel response has been characterized using laboratory measurements with a grid of artificial stars. Here, 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. We studied the effects using artificial stars projected on the sensors and find that the resulting measurement uncertainties pass the ten-year LSST survey science requirements. In addition, we verify that the tree-ring effects can be corrected using flat-field images if needed, because the astronomic shifts and shape measurement errors they induce correlate well with the flat-field signal. Nevertheless, further sensor anomaly studies with on-sky data should probe possible temporal and wavelength-dependent effects.},
doi = {10.48550/arXiv.2308.00919},
journal = {arXiv},
number = ,
volume = ,
place = {United States},
year = {Thu Aug 03 00:00:00 EDT 2023},
month = {Thu Aug 03 00:00:00 EDT 2023}
}
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