Bibcode
Guti´Errez, L.; Tamm, A.; Beckman, J. E.; Abrahamson, L.; Erwin, P.; Guittet, M.
Bibliographical reference
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
Advertised on:
3
2009
Citations
0
Refereed citations
0
Description
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.