A Deep H-band Probe of the Globular Cluster Mass function

Details A Deep H-band Probe of the Globular Cluster Mass function A Deep H-band Probe of the Globular Cluster Mass function

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10529k&link_type=abstract

HST Proposal ID #10529

Computer Science

Hst Proposal Id #10529 Stellar Populations

Scientific paper

We propose to obtain deep NICMOS H-band data for the globular clusters in the inner region of M87 and coordinated parallel ACS WFC g and z band observations of a second field which has very deep archival NICMOS data. Therefore, our proposed deep NICMOS observation overlaps corresponding deep archival optical data in the inner regions, and the parallel ACS observations overlap deep NICMOS images in the outer field. The combination of the sensitivity of the near infrared to the mass of old stellar systems such as the globular clusters in M87 and the ability of the optical to isolate the metal-rich and metal-poor subcomponents of the globular cluster system will allow us to probe the mass function, and the possible variation with metallicity, to unprecedented depths. These observations are critical to linking the commonly observed cluster luminosity function to the usually derived mass function in theoretical calculations of globular cluster and globular cluster system formation and evolution models. The multiple pointings will allow us to probe the radial variations in globular cluster properties and test the predictions of cluster formation and dynamical destruction models. Because of its extremely rich globular cluster system { 15, 000 clusters} M87 is one of the only galaxies in which such a study can be conducted with a statistically significant number of candidate clusters {approximately 300 globular clusters in this study} with efficient use of HST time.

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