Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368...54d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 54-59.
Other
33
Astronomical Photometry, Elliptical Galaxies, Spiral Galaxies, Strange Attractors, Absorption Spectra, Astronomical Catalogs, Galactic Clusters, Hubble Diagram, Red Shift
Scientific paper
New spectroscopy and photometry have been obtained for 136 elliptical and S0 galaxies in the direction of the large-scale streaming flow attributed to the great attractor. Measurements of central velocity dispersion (sigma), total B magnitudes B(T), the photometric parameter Dn, and the absorption-line index Mg2 are presented. Both internal and external comparisons indicate that measurements of log sigma are accurate to 0.05 dex, B(T) to 0.15 mag, Dn to 0.015 dex, and Mg2 to 0.017 mag. These data have been used by Dressler and Faber (1990) to estimate distances for these galaxies via the Dn-sigma relation. It is shown in this paper that the Dn-Mg2 relation also predicts the same trends of peculiar velocity with distance, but with less accuracy. The relative accuracy of other distance indicators for elliptical galaxies is also discussed.
Burstein David
Dressler Alan
Faber Sandra M.
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