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Lenticular galaxy
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===Sérsic decomposition=== The [[surface brightness]] profiles of lenticular galaxies are well described by the sum of a [[Sersic profile|Sérsic model]] for the spheroidal component plus an exponentially declining model (Sérsic index of n ≈ 1) for the disk, and often a third component for the bar.<ref>Laurikainen, Eija; Salo, Heikki; Buta, Ronald (2005), [http://adsabs.harvard.edu/abs/2005MNRAS.362.1319L Multicomponent decompositions for a sample of S0 galaxies]</ref> Sometimes there is an observed truncation in the surface brightness profiles of lenticular galaxies at ~ 4 disk scalelengths.<ref name=BMReview /> These features are consistent with the general structure of spiral galaxies. However, the bulge component of lenticulars is more closely related to elliptical galaxies in terms of morphological classification. This spheroidal region, which dominates the inner structure of lenticular galaxies, has a steeper surface brightness profile (Sérsic index typically ranging from n = 1 to 4)<ref>Andredakis, Y. C.; Peletier, R. F.; Balcells, M. (2016), [http://adsabs.harvard.edu/abs/1995MNRAS.275..874A The Shape of the Luminosity Profiles of Bulges of Spiral Galaxies]</ref><ref>Alister W. Graham and Clare C. Worley(2016), [http://adsabs.harvard.edu/abs/2008MNRAS.388.1708G Inclination- and dust-corrected galaxy parameters: bulge-to-disc ratios and size-luminosity relations]</ref> than the disk component. Lenticular galaxy samples are distinguishable from the diskless (excluding small nuclear disks) elliptical galaxy population through analysis of their surface brightness profiles.<ref>G. A. D. Savorgnan and G. W. Graham (2016), [http://adsabs.harvard.edu/abs/2016ApJS..222...10S Supermassive Black Holes and Their Host Spheroids. I. Disassembling Galaxies]</ref>
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