Bulge n and B/T in High-Mass Galaxies: Constraints on the Origin of Bulges in Hierarchical Models

We use the bulge Sersic index n and bulge-to-total mass ratio (B/T) to explore the fundamental question of how bulges form. We perform two-dimensional bulge-disk-bar decomposition on H-band images of 143 bright, high-mass (M >= 1.0 X 1010 M ) low-to-moderately inclined (i < 70°) spirals. Our r...

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Bibliographic Details
Published in:The Astrophysical journal 2009-05, Vol.696 (1), p.411-447
Main Authors: Weinzirl, Tim, Jogee, Shardha, Khochfar, Sadegh, Burkert, Andreas, Kormendy, John
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
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Summary:We use the bulge Sersic index n and bulge-to-total mass ratio (B/T) to explore the fundamental question of how bulges form. We perform two-dimensional bulge-disk-bar decomposition on H-band images of 143 bright, high-mass (M >= 1.0 X 1010 M ) low-to-moderately inclined (i < 70°) spirals. Our results are as follows. (1) Our H-band bar fraction (~58%) is consistent with that from ellipse fits. (2) 70% of the stellar mass is in disks, 10% in bars, and 20% in bulges. (3) A large fraction (~69%) of bright spirals have B/T
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/696/1/411