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Paper: Distinguishing Pseudobulges and Classical Bulges
Volume: 396, Formation and Evolution of Galaxy Disks
Page: 309
Authors: Fisher, D.; Drory, N.
Abstract: A large body of data suggests that the population of objects we call ‘bulges’ is composed of at least two types of objects. In this paper we review our recent findings of properties which distinguish these two types of bulges: pseudobulges (bulges that appear disk-like) and classical bulges (bulges that are similar to E-galaxies). We find (1) that pseudobulges have similar 3.6 μm−8.0 μm colors to their outer disks, but classical bulges do not; (2) that pseudobulges have smaller Sérsic indices in bulge-disk decompositions than classical bulges (the turnover is nb ∼ 2.2); (3) that the half-light radius of pseudobulges is coupled to the scale-length of the outer disk, yet there is no such correlation in for galaxies in classical bulge galaxies; and (4) that pseudobulges are in blue sequence galaxies where as classical bulges are in red sequence galaxies.
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