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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

Detection of differential chromatic refraction with LSST camera data

  • Matthew J Temple1
  • Phoebe N Lister1
  1. 1Durham University Centre for Extragalactic Astronomy, Department of Physics, , South Road, Durham DH1 3LE ,
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Abstract

The Earth’s atmosphere acts like a prism, deflecting blue light towards the zenith more than red light. Airmass-dependent changes in astrometry can therefore be used to infer additional information about the wavelength distribution of light within a photometric passband. The Legacy Survey of Space and Time (LSST) will observe each point in the southern sky several hundred times, with observations spread across a range of airmasses. Using commissioning data from the LSST camera released in LSST Data Preview 2, we report the detection of this differential chromatic refraction (DCR) effect in observations of galaxies and quasars in the COSMOS field. We show how information from DCR can complement the six-band colour information from LSST and help break degeneracies when selecting extragalactic samples and estimating their photometric redshifts. DCR will be a valuable resource for scientific studies and care should be taken not to remove useful DCR information from future LSST data releases.

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Cite

BibTeXRIS
BibTeX
@article{temple2026detection,
  title = {{Detection of differential chromatic refraction with LSST camera data}},
  author = {Matthew J Temple and Phoebe N Lister},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = nov,
  doi = {10.1093/mnras/stag2112},
  url = {https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2112/9012717},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Detection of differential chromatic refraction with LSST camera data
AU  - Matthew J Temple
AU  - Phoebe N Lister
PY  - 2026
DA  - 2026/11/04
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag2112
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2112/9012717
AB  - The Earth’s atmosphere acts like a prism, deflecting blue light towards the zenith more than red light. Airmass-dependent changes in astrometry can therefore be used to infer additional information about the wavelength distribution of light within a photometric passband. The Legacy Survey of Space and Time (LSST) will observe each point in the southern sky several hundred times, with observations spread across a range of airmasses. Using commissioning data from the LSST camera released in LSST Data Preview 2, we report the detection of this differential chromatic refraction (DCR) effect in observations of galaxies and quasars in the COSMOS field. We show how information from DCR can complement the six-band colour information from LSST and help break degeneracies when selecting extragalactic samples and estimating their photometric redshifts. DCR will be a valuable resource for scientific studies and care should be taken not to remove useful DCR information from future LSST data releases.
SN  - 0035-8711
SN  - 1365-2966
ER  -