Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.592c&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
Our recent HST/WFPC2 survey of mostly S0a-Sc spiral galaxies has revealed a large complexity in the inner regions of a significant fraction of such systems, including nuclear star formation, bulge-like structures characterized by an exponential light profile, and extended "nuclei". The (typically Sb-Sc) ``exponential bulges'' have mean surface brightness mu_e within the half-light radius R_e fainter than the one of R^{1/4}-law bulges, and similar to the one of disks; the ``nuclei'' (embedded in ``exponential'' or star-forming bulges) have mu_e-R_e properties similar to those of young/old star clusters, suggesting that many of them may also be star clusters of different ages. Whereas a large fraction of early/intermediate spirals does not host the ``expected'' R^{1/4} bulge, present-day secular evolution in the nuclear regions of these systems seems to lead to bulge-like structures profoundly different than the dense/old R^{1/4} bulges.
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