New D-sigma results for Coma cluster ellipticals

Details New D-sigma results for Coma cluster ellipticals New D-sigma results for Coma cluster ellipticals

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253..584l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Dec. 15, 1991, p. 584-598. Research supported by I

Astronomy and Astrophysics

Astronomy

78

Elliptical Galaxies, Galactic Clusters, Galactic Structure, Astronomical Photometry, Astronomical Spectroscopy, Brightness Distribution

Scientific paper

A total of 51 ellipticals in the Coma cluster are described in terms of photometric diameters (Ds) and velocity dispersions (sigmas) to evaluate the environmental dependence of the D-sigma relation. Observations are described of the ellipticals in the outer part of the cluster as well as some from the central region based on spectra between 4800-5600 A. Aperture photometry is employed to derive effective diameter, effective surface brightness, and photometric diameter. The zero point of the D-sigma relation varies very little from the Coma core, and the outer ellipticals possess somewhat larger Ds at fixed values of sigma. The D-sigma relation is considered a robust indicator with no surface-brightness bias, and the sample indicates that planes defined by the Virgo and Coma clusters are not fundamentally different.

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