12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Brightest Cluster Galaxies - Ages and metallicities of stellar populations

14 Jul 2011, 12:30


Oral Presentation Track D1 - Astrophysics APSS


Ms Viljoen Danièl (North-West University)


The aim of this project is to study the stellar populations, and thereby evolution and star formation histories of brightest cluster galaxies (BCGs). In particular, I will determine if a Single Stellar Populations (SSP) or Composite Stellar Populations (CSP) provides the most significant fit for the BCGs using high signal-to-noise ratio (S/N), long-slit spectra, obtained on the Gemini and WHT telescopes. By using the ULySS software package, the data will be fitted against the Pegase. HR and Vazdekis/Miles stellar population models to simultaneously derive the SSP equivalent ages and metallicities of the BCGs. Furthermore the stellar populations will be decomposed into two or more components, and the chi square (χ2) value for each component is used to determine whether a SSP or CSP represents the BCGs most accurately. We find that both young and old stars are present in the stellar populations of these BCGs, and those BCGs, therefore show surprisingly diverse star formation histories.

Level (Hons, MSc, <br> &nbsp; PhD, other)? MSC
Consider for a student <br> &nbsp; award (Yes / No)? Yes
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Ms Viljoen Danièl (North-West University)

Presentation Materials