The challenge of blending in large sky surveys

Peter Melchior, Rémy Joseph, Javier Sanchez, Niall MacCrann, Daniel Gruen

Research output: Contribution to journalReview articlepeer-review

9 Scopus citations


The increasing sensitivity of modern sky surveys allow ever fainter emissions of light to be detected, but it also increases the chances of noticeable overlap between multiple sources of light, a phenomenon called blending. The consequences of blending are expected to be among the leading systematic measurement uncertainties of future surveys, such as the Legacy Survey of Space and Time. This Perspective discusses two main approaches to addressing blending: attempting to separate individual sources and statistically correcting for the presence of blending at the population level. For both approaches, simultaneous access to data of multiple surveys will be critical to construct a joint data set that combines the strengths of each individual survey.

Original languageEnglish (US)
Pages (from-to)712-718
Number of pages7
JournalNature Reviews Physics
Issue number10
StatePublished - Oct 2021

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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