Where have all the bulges gone?

Guti´Errez, L.; Tamm, A.; Beckman, J. E.; Abrahamson, L.; Erwin, P.; Guittet, M.
Referencia bibliográfica

The Galaxy Disk in Cosmological Context, Proceedings of the International Astronomical Union, IAU Symposium, Volume 254. Poster Session. Edited by J. Andersen, J. Bland-Hawthorn and B. Nordström. Cambridge: Cambridge University Press, 2009, p.24

Fecha de publicación:
3
2009
Número de autores
6
Número de autores del IAC
0
Número de citas
0
Número de citas referidas
0
Descripción
Several recent studies indicate that bulges are more complex than merely structureless relaxed stellar systems. We study the HST images of a sample of 130 nearby early type (S0-Sab) disc galaxies and detect pure structureless bulges with the Sersic index n > 2 for only 12% of the galaxies. Other galaxies show varied substructure in their inner regions (inner bars, inner spiral arms, inner rings) and sometimes contain no bulge at all. Inner substructure is more common for these galaxies, which also display structure at larger scales.