Distinguishing Pseudobulges and Classical Bulges

Details Distinguishing Pseudobulges and Classical Bulges Distinguishing Pseudobulges and Classical Bulges

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..309f&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

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 n_{b}˜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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