The structure of giant elliptical galaxies in poor clusters of galaxies

Details The structure of giant elliptical galaxies in poor clusters of galaxies The structure of giant elliptical galaxies in poor clusters of galaxies

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..439t&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 439-459. Research supported by the Research Corp.;

Astronomy and Astrophysics

Astrophysics

119

Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Astronomical Photography, Astronomical Photometry, Brightness Distribution, Electrophotometry, Luminous Intensity

Scientific paper

Detailed photographic surface photometry is presented of the nine first brightest galaxies in poor clusters suspected of being cD galaxies. The surface photometry is put on an absolute scale, using multiaperture photoelectric photometry. Oemler (1976) and de Vaucouleurs (1948) laws are fitted to the profiles to derive structural parameters, and the structural properties of the galaxies are compared with those of the cD galaxies in rich clusters studied by Oemler (1976) and those of normal ellipticals studied by Kormendy (1977). It is found that (1) the profiles of first brightest galaxies are well fitted by an r to the 1/4 power law over a range of more than nine magnitudes and down to the faintest light levels observed and (2) structural parameters characterizing only the central part of first brightest galaxies in poor and rich clusters, and excluding the envelope component in the case of rich clusters, smoothly extend properties exhibited by normal ellipticals. These observations are consistent with the idea that the central part of first brightest galaxies in both poor and rich clusters is made up by the mergers of smaller galaxies.

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