A Caltech Library Service

Modelling of seeing effects in extragalactic astronomy and cosmology

Djorgovski, S. (1983) Modelling of seeing effects in extragalactic astronomy and cosmology. Journal of Astrophysics and Astronomy, 4 (4). pp. 271-288. ISSN 0250-6335. doi:10.1007/bf02714921.

[img] PDF (ADS) - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Djorgovski, S.0000-0002-0603-3087
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.
Funding AgencyGrant Number
University of California, BerkeleyUNSPECIFIED
NSFAST 80-20606
Subject Keywords:galaxies: elliptical; cosmology; Earth’s atmosphere: seeing
Issue or Number:4
Record Number:CaltechAUTHORS:20190723-073459410
Persistent URL:
Official Citation:Djorgovski, S. J. Astrophys. Astr. (1983) 4: 271.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97342
Deposited By: Tony Diaz
Deposited On:23 Jul 2019 16:40
Last Modified:16 Nov 2021 17:30

Repository Staff Only: item control page