Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93...33b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 33-52.
Astronomy and Astrophysics
Astronomy
33
Astronomical Photometry, Brightness Distribution, Color, Elliptical Galaxies, Galactic Nuclei, Virgo Galactic Cluster, Luminosity, Pixels, Signal To Noise Ratios, Stellar Evolution, Surface Properties
Scientific paper
The authors have obtained high-precision surface-brightness measurements in three colors of eight early-type galaxies in the Virgo cluster using a scanning CCD. The total luminosities of the galaxies in this sample span a range of 8 mag. The isophotes of each of the galaxies have been fit to a model consisting of a sequence of concentric ellipses. The parameters determined from the fit are surface brightness, colors, ellipticity, and position angle as functions of radius. Analysis of these isophotal parameters yields conclusions which are discussed in detail. In this sample there is a continuous sequence of departure from a de Vaucouleurs law profile for elliptical galaxies, with high-luminosity systems having outer envelopes above a fit to the inner regions and low-luminosity systems having less light in their outer regions than the fit.
Boroson Todd A.
Thompson Ian B.
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