Other
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..521f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 521-528.
Other
10
Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, Galactic Structure, Brightness Distribution, Diameters, Prolateness, Red Shift
Scientific paper
It is shown that the variation of isophotal diameter with observed ellipticity can be used to discriminate oblate from prolate galaxies, as long as the observed light distribution is different from an inverse square (Hubble) law. The feasibility of this test is demonstrated by applying it to a sample of cD galaxies in Abell clusters. It is found that if pole-on surface brightness is uncorrelated with intrinsic flatness, the sample is consistent with the oblate hypothesis, but that there exists a correlation between these quantities that will make the sample consistent with the prolate hypothesis. It is also shown that cD's should appear relatively smaller with increasing redshift when their diameters are compared to those of other cluster members. It is found that the cD's from richer clusters show a dispersion in diameter, corrected to pole-on, that is consistent with that expected from measurement errors alone, implying a very small intrinsic dispersion in these galaxies.
Ftaclas Chris
Struble Mitchell F.
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