NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:49:46 PDT
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For refcode 1993A&A...278...23B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1993A&A...278...23B Do elliptical galaxies have r^1/4^ brightness profiles? A. Burkert Max-Planck Institut fur Astrophysik, Karl-Schwarzschild-Str. l, 85740 Garching, Germany Received January l8, accepted June l3, 1993 Abstract. The intermediate axis surface brightness distribution of a large sample of elliptical galaxies is studied in detail. It is shown that the de Vaucouleurs law provides an excellent fit to the observed brightness distribution for all galaxies within the radius range 0.1R_e_ <= R <= 1.5 R_e_, with mean deviations smaller than 0.1 mag arcsec^-2^ and maximum deviations smaller than 0.2 mag arcsec^-2^. In addition, a small but well defined change in the slope of the best fitting r^1/4^-law is observed at a radius R ~0.4 R_e_. The fact that ellipticals fit the de Vaucouleurs law within the same effective radius range indicates that they not only have a remarkably similar surface density distribution but also an underlying universal volume density profile which can be well represented by a Jaffe or Hemquist law. These results will provide strong constraints for theoretical models of E- galaxy formation. Key words: galaxies: elliptical - galaxies: photometry
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