Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983japa....4..271d&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 4, Dec. 1983, p. 271-288.
Astronomy and Astrophysics
Astronomy
19
Astronomy, Atmospheric Effects, Cosmology, Elliptical Galaxies, Visual Observation, Convolution Integrals, Dimming, Fast Fourier Transformations, Galactic Nuclei, Galactic Structure, Hubble Diagram, Mathematical Models, Stellar Cores
Scientific paper
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.
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