SIMBAD references

2003A&A...407...61F - Astronomy and Astrophysics, volume 407, 61-74 (2003/8-3)

Do bulges of early- and late-type spirals have different morphology?


Abstract (from CDS):

We study HST/NICMOS H-band images of bulges of two equal-sized samples of early- (TRC3≤3) and late-type spiral (mainly Sbc-Sc) galaxies matched in outer disk axis ratio. We find that bulges of late-type spirals are more elongated than their counterparts in early-type spirals. Using a KS-test we find that the two distributions are different at the 98.4% confidence level. We conclude that the two data sets are different, i.e. late-type galaxies have a broader ellipticity distribution and contain more elongated features in the inner regions. We discuss the possibility that these would correspond to bars at a later evolutionary stage, i.e. secularly evolved bars. Consequent implications are raised, and we discuss relevant questions regarding the formation and structure of bulges. Are bulges of early-type and late-type spirals different? Are their formation scenarios different? Can we talk about bulges in the same way for different types of galaxies?

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: bulges - galaxies: structure - galaxies: statistics

Simbad objects: 92

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