Coherence-based investigation of stellar objects: a speckle-based approach

Steen G. Hanson*, Mitsuo Takeda, Wei Wang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Based on canonical transforms, we develop the space-time cross covariance from incoherent fields emitted from distant objects. We simplify the results to stress the aspects qualitatively, thereby falling short of exact quantities. Specifically, we argue that fourth order field correlations in the detector plane (the Earth) can reveal the difference in axial velocities (Stellar objects) for two - or several - unresolvable objects. Besides, we derive the angular velocity for a rotating cloud of objects with rotational axes, pointing towards the observer, as can the spatial cross covariance for a single object rotating about a transverse axis. We neglect relativistic effects and the influence of optical turbulence. The analysis resembles the ones performed for objects illuminated with a coherent field, although here the spatial coherence arises due to the extreme distances between object and observer, and the temporal coherence is facilitated by spectral filtering augmented optionally by adjusting the detector separation. The results are applicable for radiation in a broader spectrum including microwaves and gamma radiation.

Original languageEnglish
Title of host publicationSpeckle 2023
Subtitle of host publicationVIII International Conference on Speckle Metrology
EditorsWeiguo Liu, Wei Wang, Yechuan Zhu
ISBN (Electronic)9781510674592
ISBN (Print)9781510674585
Publication statusPublished - 4 Mar 2024
Event8th International Conference on Speckle Metrology 2023 - Xi'an, China
Duration: 18 Oct 202320 Oct 2023

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference8th International Conference on Speckle Metrology 2023
Abbreviated titleSpeckle 2023


  • angular momentum.
  • coherence theory
  • Doppler shift
  • Stellar observation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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