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Correlations between r1/4-Law Parameters for Bulges and Elliptical Galaxies

Published online by Cambridge University Press:  04 August 2017

Masaru Hamabe  and
John Kormendy
Masaru Hamabe
Affiliation:
Dominion Astrophysical Observatory Tokyo Astronomical Observatory
John Kormendy
Affiliation:
Dominion Astrophysical Observatory

Extract

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The correlation between the effective radius re and surface brightness μe for elliptical galaxies is a fundamental scaling law that theories of galaxy formation must explain. When re and μe are derived by fitting two-parameter fitting functions such as the de Vaucouleurs r1/4 law to brightness profiles, the errors in the parameters are strongly coupled. The purpose of this paper is to rederive the μe(log re) relations for ellipticals and bulges, taking account of the coupling in the errors and using only high-accuracy CCD data. Our preliminary conclusions are: (1) The coupled errors are too small to affect significantly the correlation derived for elliptical galaxies. (2) The correlation for bulges is not very different from that for ellipticals, but the galaxy sample is small and the errors in the parameters are large due to the inherent uncertainty in bulge-disk decomposition.

Type
Posters
Information
Symposium - International Astronomical Union , Volume 127: Structure and Dynamics of Elliptical Galaxies , 1987 , pp. 379 - 380
Copyright
Copyright © Reidel 1987 

References

REFERENCES

Kormendy, J. 1982, in Morphology and Dynamics of Galaxies, ed. Martinet, L. and Mayor, M. (Sauverny: Geneva Observatory), p. 113.Google Scholar
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