On the nature of apparent transient sources on the National Geographic Society-Palomar Observatory Sky Survey glass copy plates
arxiv(2024)
摘要
We examine critically recent claims for the presence of above-atmosphere
optical transients in publicly-available digitised scans of Schmidt telescope
photographic plate material derived from the National Geographic
Society-Palomar Observatory Sky Survey. We employ the publicly available
SuperCOSMOS Sky Survey catalogues to examine statistically the morphology of
the sources. We develop a simple, objective and automated image classification
scheme based on a random forest decision tree classifier. We find that the
putative transients are likely to be spurious artefacts of the photographic
emulsion. We suggest a possible cause of the appearance of these images as
resulting from the copying procedure employed to disseminate glass copy survey
atlas sets in the era before large-scale digitisation programmes.
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