Modelling of seeing effects in extragalactic astronomy and cosmology
- Creators
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Djorgovski, S.
Abstract
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.
Additional Information
© 1983 Indian Academy of Sciences. Received 1983 September 1; accepted 1983 December 7. I wish to express gratitude to Ivan King for constructive criticisms and support throughout this work, and for some crucial software used here. I would also like to thank Richard Kron for stimulating discussions about cosmological tests and the relevant effects investigated in this work. I. King, V. Lindsay and, especially, F. Schweizer provided critical reading of the manuscript. The paper benefitted greatly from the constructive remarks of two anonymous referees, for whose efforts I am very thankful. This work was partly supported through a University of California graduate fellowship, and the NSF grant AST 80-20606.Attached Files
Published - 1983JApA____4__271D.pdf
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Additional details
- Eprint ID
- 97342
- Resolver ID
- CaltechAUTHORS:20190723-073459410
- University of California, Berkeley
- AST 80-20606
- NSF
- Created
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2019-07-23Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field