Stellar populations in central cluster galaxies: the influence of cooling flows
Abstract
We present detailed, high spatial and spectral resolution, long-slit observations of four central
cluster galaxies (CCGs; Abell 0085, 0133, 0644 and Ophiuchus) recently obtained on the
Southern African Large Telescope. Our sample consists of CCGs with previously observed
Hα filaments, and have existing data from the X-ray to radio wavelength regimes available.
Here, we present the detailed optical data over a broad wavelength range to probe the spatially
resolved kinematics and stellar populations of the stars. We use the PEGASE.HR model with the
ELODIE v3.1 stellar library to determine the star formation histories of the galaxies using full
spectrum fitting. We perform single stellar population as well as composite stellar population
fits to account formore complex star formation histories. MonteCarlo simulations and χ2 maps
are used to check the reliability of the solutions. This, combined with the other multiwavelength
data, will form a complete view of the different phases (hot and cold gas and stars) and how
they interact in the processes of star formation and feedback detected in central galaxies in
cooling flow clusters, as well as the influence of the host cluster. We find small, young stellar
components in at least three of the four galaxies, even though two of the three host clusters
have zero spectrally derived mass deposition rates from X-ray observations
URI
http://hdl.handle.net/10394/16555https://doi.org/10.1093/mnras/stu020
https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stu020
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