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Date and Time of the Query: 2019-05-26 T17:15:35 PDT
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For refcode 1992ApJ...384...43G:
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Copyright by American Astronomical Society. Reproduced by permission
1992ApJ...384...43G STELLAR POPULATION-INDUCED PECULIAR VELOCITIES OF ELLIPTICAL GALAXIES MICHAEL D. GREGG Mount Stromlo and Siding Spring Observatories, Institute of Advanced Studies, The Australian National University, Private Bag, Weston Creek P.O., A.C.T. 2611, Australia Received 1991 April 19; accepted 1991 June 25 ABSTRACT 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 D_n_-{sigma} relation of Dressler and his coworkers, to be underestimated, in turn yielding systematically large peculiar velocities measured against the cosmic microwave background. In the galaxy sample of Schweizer and coworkers, elliptical galaxies which exhibit more pronounced "fine structure" have bluer colors, higher surface brightness, and lower Mg_2_ index relative to the mean relationship for ellipticals. These differences are probably due to recent star formation caused by whatever process has given rise to the fine structure. These objects have systematically large positive and probably spurious peculiar velocities. Subject headings: galaxies: kinematics and dynamics - galaxies: photometry - galaxies: stellar content
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