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of the definition of specific frequency of globular clusters, which describes the
number of globular clusters per luminosity interval.
a. It is estimated that M31 has approximately 350 globular clusters. If its
absolute visual magnitude is –21.7, estimate the specific frequency for its
b. NGC3311 is a cD (central dominant) galaxy with an estimated 17,000
globular clusters and an absolute visual magnitude of –22.4. Estimate the
specific frequency of clusters in this galaxy.
c. cD galaxies are very large “super-elliptical” galaxies that reside at the
centers of galaxy clusters. It has been suggested that these monsterous
galaxies form via the mergers or already formed spiral galaxies deep in the
potential well of the galaxy cluster. Discuss the problem the globular
cluster statistics in parts (a) and (b) present for this model. – Page 3 of 3 –...
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- Spring '14