Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384...43g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 43-49.
Astronomy and Astrophysics
Astrophysics
31
Astrometry, Elliptical Galaxies, Galactic Structure, Star Distribution, Astronomical Photometry, Velocity Distribution
Scientific paper
The peculiar velocities of elliptical galaxies exhibiting 'fine structure' (deviations from elliptical isophotes) are shown to be correlated with various stellar population-related quantities, demonstrating that photometric distance indicators can be affected by the stellar population within galaxies. Ellipticals with current or recent star formation will have relatively higher luminosities and larger photometrically determined diameters. This causes their distances, as determined by photometric methods such as the Dn-sigma relation of Dressler et al. (1987, 1988), to be underestimated, in turn yielding systematically large peculiar velocities measured against the cosmic microwave background. In the galaxy sample of Schweizer et al. (1990), elliptical galaxies which exhibit more pronounced 'fine structure' have bluer colors, higher surface brightness, and lower Mg2 index relative to the mean relationship for ellipticals.
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