Abstract
Bulges, often identified with the spheroidal component of a galaxy,have a complex pedigree. Massive bulges are generally red and old,but lower mass bulges have broader dispersions in color that may becorrelated with disk colors. This suggests different formationscenarios. I will review possible formation sequences for bulges,describe the various signatures that distinguish these scenarios, anddiscuss implications for the high redshift universe.
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Silk, J., Bouwens, R. Formation of Bulges. Astrophysics and Space Science 265, 379–387 (1999). https://doi.org/10.1023/A:1002117507294
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DOI: https://doi.org/10.1023/A:1002117507294