Journal of Astrophysics and Astronomy

, Volume 4, Issue 4, pp 271–288 | Cite as

Modelling of seeing effects in extragalactic astronomy and cosmology

  • S. Djorgovski


Convolution methods for modelling of astronomical seeing effects have been investigated. The advantages and disadvantages of several techniques are discussed, and particular attention is given to the fast Fourier transform (FFT) method. This method is then applied to two classes of problems, the structure of cores of elliptical galaxies, appearance of distant galaxies and the consequences of seeing effects in some cosmological tests. Estimates are presented for dimming of the central surface brightness and changes in the apparent core radius for elliptical galaxies, as well as seeing-induced changes in ellipticity. Modelling of galaxies with stellar nuclei has also been performed. Some consequences of these effects in investigations of dynamics of elliptical galaxies are addressed briefly. The influence of seeing in observational cosmology is discussed in the context of Hubble diagram (m-z) tests. It is shown that inadequate compensation for seeing effects can seriously distort the conclusions in such tests. Some suggestions for future work in this direction are offered.

Key words

galaxies: elliptical cosmology Earth’s atmosphere: seeing 


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Copyright information

© Indian Academy of Sciences 1983

Authors and Affiliations

  • S. Djorgovski
    • 1
  1. 1.Department of AstronomyUniversity of CaliforniaBerkeleyUSA

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