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A Revised Parallel-sequence Morphological Classification of Galaxies: Structure and Formation of S0 and Spheroidal Galaxies

  • Authors: John Kormendy and Ralf Bender

Kormendy & Bender 2012 The Astrophysical Journal Supplement Series 198 2.

  • Provider: AAS Journals

Caption: Figure 8.

Top: color image of SB(lens)0 galaxy NGC 4452 from the SDSS g,r,i images via http://www.wikisky.org. The bulge—which proves to be pseudo—is so tiny that it is almost invisible. The inner disk is edge-on and very flat; it again consists of two shelves in surface brightness. Including the outer, thicker disk, these three shelves are signatures of a bar, lens, and disk. Bottom: ellipticity epsilon and surface brightness μ V along the major axis of NGC 4452 measured by fitting ellipses to the isophotes in the ACS and SDSS g-band images. The five dashed curves show a decomposition of the profile inside the fit range (vertical dashes). The nucleus, bulge, bar, lens, and disk are represented by Sérsic functions with indices n as given in the figure. The sum of the components (solid curve) fits the data with an rms of 0.044 V mag arcsec −2.

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