The spatial distributions and intrinsic shapes of dwarf elliptical galaxies in the Virgo and Fornax Clusters

Details The spatial distributions and intrinsic shapes of dwarf elliptical galaxies in the Virgo and Fornax Clusters The spatial distributions and intrinsic shapes of dwarf elliptical galaxies in the Virgo and Fornax Clusters

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346l..53f&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. L53-L56.

Astronomy and Astrophysics

Astronomy

91

Dwarf Galaxies, Elliptical Galaxies, Sky Surveys (Astronomy), Spatial Distribution, Virgo Galactic Cluster, Astronomical Photography, Density Distribution, Galactic Structure, Irregular Galaxies, Luminosity

Scientific paper

Data from deep photographic surveys of the Fornax and Virgo Clusters show that the projected radial number density profile of dwarf ellipticals in these clusters depends both on luminosity and on the presence or absence of nucleation. All nucleated dE's and the nonnucleated dE's that are fainter than M(B)T about -14.2 are concentrated toward the centers of clusters like the giant E and S0 galaxies. In contrast, nonnucleated dE's brighter than M(B)T about -14.2 are distributed like the spirals and irregulars. Furthermore, the flattening distribution of bright nonnucleated dE's is similar to that of the dwarf irregulars, but differs from the flattening distribution of either the nucleated dwarfs (dE, N) or of the giant ellipticals. The similarity of flattenings of dE (bright, no N) and Im types removes one of the previous objections to the hypothesis that some dwarf ellipticals could be stripped Im's. However, the data are also consistent with stochastic self-propagating star-formation models of irregular galaxies.

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