Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..404l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 2, Sept. 15, 1992, p. 404-414. Research suppor
Astronomy and Astrophysics
Astronomy
102
Astronomical Models, Elliptical Galaxies, Galactic Structure, Sky Surveys (Astronomy), Spiral Galaxies, Monte Carlo Method, Oblate Spheroids, Prolate Spheroids
Scientific paper
The distribution of axial ratios of images in the APM Bright Galaxy Survey is analyzed. The sample contains a total of 20,399 galaxies. Analytic inversion is used to infer the true distribution of axial ratios for oblate and prolate models. Monte Carlo techniques are also used to explore triaxial models. For elliptical galaxies, it is found that neither pure oblate nor pure prolate models can satisfactorily account for the observed distribution of apparent axial ratios, since the derived solutions for the distribution of true axial ratios become significantly negative for q less than 0.9. Triaxial models in which the true axial ratios b/a and c/a of galaxies are selected from Gaussian distributions are considered. Possible variations of the intrinsic flattening of ellipticals depending on low and high local density environments are analyzed. Projected distributions of axial ratios of high and low local density environment ellipticals are found to be remarkably similar. No evidence was found to indicate that the environment has significantly affected the shapes of early-type galaxies.
Lambas Diego G.
Loveday Jon
Maddox Steve J.
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