The Age and Mass Function of the Intermediate Age Globular Cluster System of NGC 4365

Details The Age and Mass Function of the Intermediate Age Globular Cluster System of NGC 4365 The Age and Mass Function of the Intermediate Age Globular Cluster System of NGC 4365

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9878z&link_type=abstract

HST Proposal ID #9878

Physics

Hst Proposal Id #9878 Galaxies

Scientific paper

We propose to obtain deep H-band photometry of the globular cluster system of the elliptical galaxy NGC 4365, which has previously been shown from shallow data to have a significant population of intermediate-age globular clusters. These data will allow us to constrain the luminosity and mass function of the intermediate-aged globular cluster system. This is a critical step in understanding the relationship between the young dense star cluster systems observed in galaxy mergers and starbursts, which have a power-law mass functions, and well known old, globular cluster systems, which have a lognormal mass functions. Specifically, the large intermediate-age cluster population in NGC 4365 provides the best case to test whether the power-law mass function of young systems evolves into a lognormal with the properties of old globular cluster systems. Dynamical models have long suggested such an evolution of a power-law mass function to a roughly log-normal one but there is no clear observational evidence yet in elliptical galaxies for steps along this process. Our proposed study of the intermediate-age cluster system of NGC 4365 will provide us with the fundamental information needed to conclusively establish the relationship between young and old globular cluster systems.

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