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24 April 2024 |
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Article overview
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Do Bulges of Early- and Late-type Spirals Have Different Morphology? | K. Fathi
; R. F. Peletier
; | Date: |
19 May 2003 | Journal: | Astron.Astrophys. 407 (2003) 61-74 | Subject: | astro-ph | Affiliation: | University of Nottingham, Observatoire de Lyon) and R. F. Peletier (University of Nottingham, Observatoire de Lyon | Abstract: | We study HST/NICMOS H-band images of bulges of two equal-sized samples of early- (T(RC3) < 4) 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? | Source: | arXiv, astro-ph/0305326 | Services: | Forum | Review | PDF | Favorites |
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