Kavli Affiliate: Aaron Roodman
| First 5 Authors: Johnny H. Esteves, Yousuke Utsumi, Adam Snyder, Theo Schutt, Alex Broughton
| Summary:
The Vera C. Rubin Observatory’s LSST Camera 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. 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.
| Search Query: ArXiv Query: search_query=au:”Aaron Roodman”&id_list=&start=0&max_results=3