Reaching the Horizontal Branch in NGC 5128: Deepest Probe of a Giant Elliptical

Details Reaching the Horizontal Branch in NGC 5128: Deepest Probe of a Giant Elliptical Reaching the Horizontal Branch in NGC 5128: Deepest Probe of a Giant Elliptical

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9373r&link_type=abstract

HST Proposal ID #9373

Physics

Hst Proposal Id #9373

Scientific paper

NGC 5128 is the nearest easily observable giant E galaxy, and is a unique testing ground for stellar population models. Previous WFPC2 photometry of its halo red-giant stars has shown that they are predominantly metal-rich { -0.45}, but little is yet known about their spread in ages. With the ACS/WFC camera, we propose to obtain deep {V, I} photometry down to the level of its horizontal-branch population, with the goal of refining the metallicity distribution function and gaining quantitative information on its age distribution. This will be unique data for any giant elliptical galaxy and will provide major new input to population synthesis techniques for such galaxies.

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