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| Paper: |
Evolution of Galaxy Bulges |
| Volume: |
275, Disks of Galaxies: Kinematics, Dynamics and Perturbations |
| Page: |
83 |
| Authors: |
Balcells, M. |
| Abstract: |
I present our recent results on bulge evolution. (1) We have modeled the accretion of satellite galaxies onto disk-bulge-halo galaxies, and show that accretion-driven bulge growth generates two of the observed trends of galaxies along the Hubble sequence, namely the higher Sersic index toward more massive bulges, and the appearance of a thick disk with greater scale length than that of the thin disk. These results suggest that collisionless merging might have been important for large bulges, and unimportant for bulges with ~ exponential surface brightness profiles. (2) We have derived the B- and K-band Fundamental Plane (FP) for a sample of inclined bulges, finding a tight agreement with that of Coma ellipticals. This finding argues against a significant young population of bulges irrespective of the Sersic index. (3) We have used HST/NICMOS imaging of S0 -- Sbc bulges to derive systematics of central profile slopes and central densities. We find power-law slopes in the inner 100 pc that are comparable to those of intermediate luminosity ellipticals. |
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