Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..275...83b&link_type=abstract
Disks of Galaxies: Kinematics, Dynamics and Peturbations, ASP Conference Proceedings, Vol. 275. Edited by E. Athanassoula, A. Bo
Astronomy and Astrophysics
Astronomy
Scientific paper
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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