NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T01:45:40 PDT
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For refcode 2003A&A...407...61F:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...407...61F Do bulges of early- and late-type spirals have different morphology? Fathi, K.; Peletier, R. F. Abstract. We study HST/NICMOS H-band images of bulges of two equal-sized samples of early- (T_RC3_ <= 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? Keywords: galaxies: spiral, galaxies: bulges, galaxies: structure, galaxies: statistics
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